![Seitenkipper-Ua4201-Drehgestell](https://upload.wikimedia.org/wikipedia/commons/e/e0/Seitenkipper-Ua4201-Drehgestell.jpg)
A bogie ( ) (in some
senses
A sense is a biological system used by an organism for sensation, the process of gathering information about the world through the detection of stimuli. (For example, in the human body, the brain which is part of the central nervous system rec ...
called a truck in North American English) is a
chassis
A chassis (, ; plural ''chassis'' from French châssis ) is the load-bearing framework of an artificial object, which structurally supports the object in its construction and function. An example of a chassis is a vehicle frame, the underpart ...
or framework that carries a
wheelset, attached to a vehicle—a
modular
Broadly speaking, modularity is the degree to which a system's components may be separated and recombined, often with the benefit of flexibility and variety in use. The concept of modularity is used primarily to reduce complexity by breaking a s ...
subassembly of
wheels
A wheel is a circular component that is intended to rotate on an axle bearing. The wheel is one of the key components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be ...
and
axle
An axle or axletree is a central shaft for a rotating wheel or gear. On wheeled vehicles, the axle may be fixed to the wheels, rotating with them, or fixed to the vehicle, with the wheels rotating around the axle. In the former case, bearing ...
s. Bogies take various forms in various modes of transport. A bogie may remain normally attached (as on many
railroad car
A railroad car, railcar (American and Canadian English), railway wagon, railway carriage, railway truck, railwagon, railcarriage or railtruck (British English and UIC), also called a train car, train wagon, train carriage or train truck, is a ...
s and
semi-trailer
A semi-trailer is a trailer without a front axle. In the United States, the term is also used to refer to the combination of a truck and a semi-trailer; a tractor-trailer.
A large proportion of a semi-trailer's weight is supported by a tracto ...
s) or be quickly detachable (as the
dolly in a
road train
A road train, land train or long combination vehicle (LCV) is a trucking vehicle used to move road freight more efficiently than semi-trailer trucks. It consists of two or more trailers or semi-trailers hauled by a prime mover.
History
Early ...
or in railway
bogie exchange
Bogie exchange is a system for operating railway wagons on two or more gauges to overcome difference in the track gauge. To perform a bogie exchange, a car is converted from one gauge to another by removing the bogies or trucks (the chassis cont ...
); it may contain a
suspension
Suspension or suspended may refer to:
Science and engineering
* Suspension (topology), in mathematics
* Suspension (dynamical systems), in mathematics
* Suspension of a ring, in mathematics
* Suspension (chemistry), small solid particles suspend ...
within it (as most rail and trucking bogies do), or be solid and in turn be suspended (as most bogies of
tracked vehicles are); it may be mounted on a
swivel
A swivel is a connection that allows the connected object, such as a gun, chair, swivel caster, or an anchor rode to rotate horizontally or vertically.
Swivel designs
A common design for a swivel is a cylindrical rod that can turn freely wi ...
, as traditionally on a railway carriage or locomotive, additionally jointed and sprung (as in the
landing gear
Landing gear is the undercarriage of an aircraft or spacecraft that is used for takeoff or landing. For aircraft it is generally needed for both. It was also formerly called ''alighting gear'' by some manufacturers, such as the Glenn L. Martin ...
of an
airliner
An airliner is a type of aircraft for transporting passengers and air cargo. Such aircraft are most often operated by airlines. Although the definition of an airliner can vary from country to country, an airliner is typically defined as an ...
), or held in place by other means (centreless bogies).
In Scotland, the term is used for a child’s (usually home-made) wooden cart.
While ''bogie'' is the preferred spelling and first-listed variant in various dictionaries,
bogey and bogy are also used.
Railway
A ''bogie'' in the UK, or a ''railroad truck'', ''wheel truck'', or simply ''truck'' in North America, is a structure underneath a
railway vehicle
The term rolling stock in the rail transport industry refers to railway vehicles, including both powered and unpowered vehicles: for example, locomotives, freight and passenger cars (or coaches), and non-revenue cars. Passenger vehicles can be ...
(wagon, coach or locomotive) to which axles (and, hence, wheels) are attached through
bearings. In
Indian English
Indian English (IE) is a group of English dialects spoken in the republic of India and among the Indian diaspora. English is used by the Indian government for communication, along with Hindi, as enshrined in the Constitution of India. E ...
, ''bogie'' may also refer to an entire
railway carriage
A railroad car, railcar (American and Canadian English), railway wagon, railway carriage, railway truck, railwagon, railcarriage or railtruck (British English and UIC), also called a train car, train wagon, train carriage or train truck, is a ...
. In
South Africa
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...
, the term ''bogie'' is often alternatively used to refer to a freight or goods wagon (shortened from ''
bogie wagon
A bogie bolster wagon is a British railway term for a wagon designed to carry long thin cargoes such as timber or rails and other steel sections. The sides and ends are minimal and there is no roof. The load is carried longitudinally and borne by ...
'').
![Jervis' Bogie Locomotive](https://upload.wikimedia.org/wikipedia/commons/6/6d/Jervis%27_Bogie_Locomotive.jpg)
The bogie was invented by
John B. Jervis
John Bloomfield Jervis (December 14, 1795 – January 12, 1885) was an American civil engineer. America's leading consulting engineer of the antebellum era (1820–60), Jervis designed and supervised the construction of five of America's earliest ...
along with the
4-2-0
Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles, two powered driving wheels on one axle and no trailing wheels. This type of locomotive is often called a ...
locomotive to support the
firebox
Firebox may refer to:
*Firebox (steam engine), the area where the fuel is burned in a steam engine
*Firebox (architecture), the part of a fireplace where fuel is combusted
*Firebox Records
Firebox Records was a Finnish record label based in S ...
on it in the early 1830s, but it didn't get accepted for decades. The first standard gauge British railway to build coaches with bogies, instead of rigidly mounted axles, was the
Midland Railway
The Midland Railway (MR) was a railway company in the United Kingdom from 1844. The Midland was one of the largest railway companies in Britain in the early 20th century, and the largest employer in Derby, where it had its headquarters. It am ...
in 1874.
Purpose
![Indirect truck](https://upload.wikimedia.org/wikipedia/commons/e/e6/Indirect_truck.gif)
Bogies serve a number of purposes:
* Support of the rail vehicle body
* Stability on both straight and curved track
* Improve
ride quality
Ride quality refers to a vehicle's effectiveness in insulating the occupants from undulations in the road surface (e.g., bumps or corrugations).
A vehicle with good ride quality provides a comfort for the driver and passengers.
Importance
Good r ...
by absorbing vibration and minimizing the impact of centrifugal forces when the train runs on curves at high speed
* Minimizing generation of track irregularities and rail abrasion
Usually, two bogies are fitted to each
carriage
A carriage is a private four-wheeled vehicle for people and is most commonly horse-drawn. Second-hand private carriages were common public transport, the equivalent of modern cars used as taxis. Carriage suspensions are by leather strapping an ...
, wagon or
locomotive
A locomotive or engine is a rail transport vehicle that provides the Power (physics), motive power for a train. If a locomotive is capable of carrying a payload, it is usually rather referred to as a multiple unit, Motor coach (rail), motor ...
, one at each end. Another configuration is often used in
articulated vehicle
An articulated vehicle is a vehicle which has a permanent or semi-permanent pivot joint
In animal anatomy, a pivot joint (trochoid joint, rotary joint or lateral ginglymus) is a type of synovial joint whose movement axis is parallel to the lo ...
s, which places the bogies (often
Jacobs bogie
Jacobs bogies (named after Wilhelm Jakobs,, 1858–1942, a German mechanical railway engineer) are a type of rail vehicle bogie commonly found on articulated railcars and tramway vehicles.
Instead of being underneath a piece of rolling stock, ...
s) under the connection between the carriages or wagons.
Most bogies have two axles,
but some cars designed for heavy loads have more axles per bogie. Heavy-duty cars may have more than two bogies using
span bolster
Span may refer to:
Science, technology and engineering
* Span (unit), the width of a human hand
* Span (engineering), a section between two intermediate supports
* Wingspan, the distance between the wingtips of a bird or aircraft
* Sorbitan ester ...
s to equalize the load and connect the bogies to the cars.
Usually, the train floor is at a level above the bogies, but the floor of the car may be lower between bogies, such as for a
bilevel rail car
A bilevel car (American English) or double-decker coach (British English and Canadian English) is a type of rail car that has two levels of passenger accommodation, as opposed to one, increasing passenger capacity (in example cases of up to ...
to increase interior space while staying within
height restrictions, or in easy-access, stepless-entry, low-floor trains.
Components
![Railroad truck, FM55-20](https://upload.wikimedia.org/wikipedia/commons/6/66/Railroad_truck%2C_FM55-20.Fig8-8.png)
Key components of a bogie include:
* The bogie frame: This can be of inside frame type where the main frame and bearings are between the wheels, or (more commonly) of outside frame type where the main frame and bearings are outside the wheels.
*
Suspension
Suspension or suspended may refer to:
Science and engineering
* Suspension (topology), in mathematics
* Suspension (dynamical systems), in mathematics
* Suspension of a ring, in mathematics
* Suspension (chemistry), small solid particles suspend ...
to absorb shocks between the bogie frame and the rail vehicle body. Common types are
coil spring
A selection of conical coil springs
The most common type of spring is the coil spring, which is made out of a long piece of metal that is wound around itself.
Coil springs were in use in Roman times, evidence of this can be found in bronze Fib ...
s,
leaf spring
A leaf spring is a simple form of spring commonly used for the suspension in wheeled vehicles. Originally called a ''laminated'' or ''carriage spring'', and sometimes referred to as a semi-elliptical spring, elliptical spring, or cart spring, it ...
s and
rubber
Rubber, also called India rubber, latex, Amazonian rubber, ''caucho'', or ''caoutchouc'', as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds. Thailand, Malaysia, and ...
airbags
An airbag is a vehicle occupant-restraint system using a bag designed to inflate extremely quickly, then quickly deflate during a collision. It consists of the airbag cushion, a flexible fabric bag, an inflation module, and an impact sensor. T ...
.
* At least one
wheelset, composed of an axle with
bearings and a wheel at each end.
* The
bolster
A bolster is a long narrow pillow or cushion filled with cotton, down or fibre. Bolsters are usually firm for back or arm support or for decorative application.Von Tobel, Jackie. "Neck Rolls and Bolsters." The Design Directory of Bedding. La ...
, the main crossmember, connected to the bogie frame through the secondary suspension. The railway car is supported at the pivot point on the bolster.
* Axle box suspensions absorb shocks between the axle bearings and the bogie frame. The axle box suspension usually consists of a spring between the bogie frame and axle bearings to permit up-and-down movement, and sliders to prevent lateral movement. A more modern design uses solid rubber springs.
*
Brake equipment: Two main types are used:
brake shoe
A brake shoe is the part of a braking system which carries the brake lining in the drum brakes used on automobiles, or the brake block in train brakes and bicycle brakes. A device that is put on a track to slow down railroad cars is also called ...
s that are pressed against the tread of the wheel, and
disc brakes
A disc brake is a type of brake that uses the calipers to squeeze pairs of pads against a disc or a "rotor" to create friction. This action slows the rotation of a shaft, such as a vehicle axle, either to reduce its rotational speed or to hol ...
and pads.
* In powered vehicles, some form of
transmission
Transmission may refer to:
Medicine, science and technology
* Power transmission
** Electric power transmission
** Propulsion transmission, technology allowing controlled application of power
*** Automatic transmission
*** Manual transmission
*** ...
, usually electrically powered
traction motor
A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives, electric vehicle, electric or hydrogen vehicles, elevators or electric multiple unit.
Traction motors are used in electrically powered rail vehicles (ele ...
s with a single speed gearbox or a hydraulically powered
torque converter
A torque converter is a type of fluid coupling that transfers rotating power from a prime mover, like an internal combustion engine, to a rotating driven load. In a vehicle with an automatic transmission, the torque converter connects the power ...
.
The connections of the bogie with the rail vehicle allow a certain degree of rotational movement around a vertical axis pivot (bolster), with side bearers preventing excessive movement. More modern, bolsterless bogie designs omit these features, instead taking advantage of the sideways movement of the suspension to permit rotational movement.
Locomotives
= Diesel and electric
=
Modern
diesel
Diesel may refer to:
* Diesel engine, an internal combustion engine where ignition is caused by compression
* Diesel fuel, a liquid fuel used in diesel engines
* Diesel locomotive, a railway locomotive in which the prime mover is a diesel engin ...
and
electric
Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by ...
locomotives are mounted on bogies. Those commonly used in the North America include
Type A,
Blomberg, HT-C and
Flexicoil
Flexicoil suspension is a type of secondary suspension for railway vehicles, typically having steel coil springs between the bogie trucks and chassis/frame of a passenger coach, goods freight wagon, or locomotive. Suspension systems using ste ...
trucks.
= Steam
=
On a
steam locomotive
A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomot ...
, the
leading
In typography, leading ( ) is the space between adjacent lines of type; the exact definition varies.
In hand typesetting, leading is the thin strips of lead (or aluminium) that were inserted between lines of type in the composing stick to incre ...
and
trailing wheel
On a steam locomotive, a trailing wheel or trailing axle is generally an unpowered wheel or axle ( wheelset) located behind the driving wheels. The axle of the trailing wheels is usually located in a trailing truck. On some large locomotives, ...
s may be mounted on bogies like
pony truck
A Bissell or Bissel truck (also Bissel bogie or Pony truck) is a single-axle bogie which pivots towards the centre of a steam locomotive to enable it to negotiate curves more easily. Invented in 1857 by and usually then known as a ''pony truck' ...
s or
Bissel bogie
A Bissell or Bissel truck (also Bissel bogie or Pony truck) is a single-axle bogie which pivots towards the centre of a steam locomotive to enable it to negotiate curves more easily. Invented in 1857 by and usually then known as a ''pony truck'' ...
s.
Articulated locomotive
An articulated locomotive is a steam locomotive (rarely, an electric locomotive) with one or more engine units that can move independent of the main frame. Articulation allows the operation of locomotives that would otherwise be too large to neg ...
s (e.g.
Fairlie,
Garratt
A Garratt (often referred to as a Beyer Garratt) is a type of steam locomotive invented by British engineer Herbert William Garratt that is articulated into three parts. Its boiler, firebox, and cab are mounted on a centre frame or "bridge ...
or
Mallet
A mallet is a tool used for imparting force on another object, often made of rubber or sometimes wood, that is smaller than a maul or beetle, and usually has a relatively large head. The term is descriptive of the overall size and proport ...
locomotives) have power bogies similar to those on diesel and electric locomotives.
Rollbock
A rollbock is a specialized type of bogie that is inserted under the wheels of a rail wagon/car, usually to convert for another
track gauge
In rail transport, track gauge (in American English, alternatively track gage) is the distance between the two rails of a railway track. All vehicles on a rail network must have wheelsets that are compatible with the track gauge. Since many d ...
. Transporter wagons carry the same concept to the level of a
flatcar
A flatcar (US) (also flat car, or flatbed) is a piece of rolling stock that consists of an open, flat deck mounted on a pair of trucks (US) or bogies (UK), one at each end containing four or six wheels. Occasionally, flat cars designed to carry ...
specialized to take other cars as its load.
Archbar bogies
In archbar or diamond frame bogies, the
side frames are
fabricated rather than
cast
Cast may refer to:
Music
* Cast (band), an English alternative rock band
* Cast (Mexican band), a progressive Mexican rock band
* The Cast, a Scottish musical duo: Mairi Campbell and Dave Francis
* ''Cast'', a 2012 album by Trespassers William
* ...
.
File:Oigawa-Archbar-Truck.jpg, Japanese archbar bogie with axlebox
A bogie or railroad truck holds the wheel sets of a rail vehicle.
Axlebox
An ''axle box'', also known as a ''journal box'' in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; ...
es
File:Diamond Frame bogie (elliptical).jpg, Diamond frame bogie, elliptical springs and American style journal box
A bogie or railroad truck holds the wheel sets of a rail vehicle.
Axlebox
An ''axle box'', also known as a ''journal box'' in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; ...
es
File:Diamond Frame bogie (coil).JPG, Diamond frame bogie, coil spring
A selection of conical coil springs
The most common type of spring is the coil spring, which is made out of a long piece of metal that is wound around itself.
Coil springs were in use in Roman times, evidence of this can be found in bronze Fib ...
s and journal box
A bogie or railroad truck holds the wheel sets of a rail vehicle.
Axlebox
An ''axle box'', also known as a ''journal box'' in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; ...
es
File:archbar ACL143.JPG , Archbar bogie with journal bearing
A plain bearing, or more commonly sliding contact bearing and slide bearing (in railroading sometimes called a solid bearing, journal bearing, or friction bearing), is the simplest type of bearing, comprising just a bearing surface and no roll ...
s in American style journal boxes, as used on some steam locomotive tenders. Archbar bogies (trucks) were also used on freight cars
A railroad car, railcar (American and Canadian English), railway wagon, railway carriage, railway truck, railwagon, railcarriage or railtruck (British English and UIC), also called a train car, train wagon, train carriage or train truck, is a ...
.
Tramway
Modern
Tram
A tram (called a streetcar or trolley in North America) is a rail vehicle that travels on tramway tracks on public urban streets; some include segments on segregated right-of-way. The tramlines or networks operated as public transport are ...
bogies are much simpler in design because of their axle load, and the tighter curves found on tramways mean tram bogies almost never have more than two axles. Furthermore, some tramways have steeper gradients and vertical, as well as horizontal, curves, which means tram bogies often need to pivot on the horizontal axis, as well.
Some
articulated tram
Trams have been used since the 19th century, and since then, there have been various uses and designs for trams around the world. This article covers the many design types, most notably the articulated, double-decker, drop-centre, low-floor, si ...
s have bogies located under articulations, a setup referred to as a
Jacobs bogie
Jacobs bogies (named after Wilhelm Jakobs,, 1858–1942, a German mechanical railway engineer) are a type of rail vehicle bogie commonly found on articulated railcars and tramway vehicles.
Instead of being underneath a piece of rolling stock, ...
. Often,
low-floor tram
A low-floor tram is a tram that has no stairsteps between one or more entrances and part or all of the passenger cabin. The low-floor design improves the accessibility of the tram for the public, and also may provide larger windows and more airspac ...
s are fitted with nonpivoting bogies and many
tramway enthusiasts see this as a retrograde step, as it leads to more wear of both track and wheels and also significantly reduces the speed at which a tram can round a curve.
Historic
In the past, many different types of bogie (truck) have been used under tramcars (e.g.
Brill
Brill may refer to:
Places
* Brielle (sometimes "Den Briel"), a town in the western Netherlands
* Brill, Buckinghamshire, a village in England
* Brill, Cornwall, a small village to the west of Constantine, Cornwall, UK
* Brill, Wisconsin, an un ...
, Peckham, maximum traction). A maximum traction truck has one driving axle with large wheels and one nondriving axle with smaller wheels. The bogie pivot is located off-centre, so more than half the weight rests on the driving axle.
Hybrid systems
![Bogie-metro-Meteor-p1010692](https://upload.wikimedia.org/wikipedia/commons/f/fd/Bogie-metro-Meteor-p1010692.jpg)
The retractable stadium roof on Toronto's
Rogers Centre
Rogers Centre (originally SkyDome) is a multi-purpose retractable roof stadium in Downtown Toronto, Ontario, Canada, situated at the base of the CN Tower near the northern shore of Lake Ontario. Opened in 1989 on the former Railway Lands, it ...
used modified off-the-shelf train bogies on a circular rail. The system was chosen for its proven reliability.
Rubber-tyred metro
A rubber-tyred metro or rubber-tired metro is a form of rapid transit system that uses a mix of road and rail technology. The vehicles have wheels with rubber tires that run on rolling pads inside guide bars for traction, as well as traditional ...
trains use a specialised version of railway bogies. Special flanged steel wheels are behind the rubber-tired running wheels, with additional horizontal guide wheels in front of and behind the running wheels, as well. The unusually large flanges on the steel wheels guide the bogie through standard
railroad switch
A railroad switch (), turnout, or ''set ofpoints () is a mechanical installation enabling railway trains to be guided from one track to another, such as at a railway junction or where a spur or siding branches off.
The most common ty ...
es, and in addition keep the train from
derailing
In rail transport, a derailment occurs when a rail vehicle such as a train comes off its rails. Although many derailments are minor, all result in temporary disruption of the proper operation of the railway system and they are a potentially ...
in case the tires deflate.
Variable gauge axles
To overcome
breaks of gauge some bogies are being fitted with variable gauge axles (VGA) so that they can operate on two different gauges. These include the
SUW 2000 system from
ZNTK Poznań.
Cleminson system
The Cleminson system is not a true bogie, but serves a similar purpose. It was based on a patent of 1883 by James Cleminson, and was once popular on narrow-gauge rolling stock, e.g. on the
Isle of Man
)
, anthem = "O Land of Our Birth"
, image = Isle of Man by Sentinel-2.jpg
, image_map = Europe-Isle_of_Man.svg
, mapsize =
, map_alt = Location of the Isle of Man in Europe
, map_caption = Location of the Isle of Man (green)
in Europe ...
and
Manx Northern Railway
The Manx Northern Railway (MNR) was the second common carrier railway built in the Isle of Man. It operated as an independent concern only from 1879 to 1905.
History
When the people in the town of Ramsey realised their town was not going to ...
s. The vehicle would have three axles and the outer two could pivot to adapt to curvature of the track. The pivoting was controlled by levers attached to the third (centre) axle, which could slide sideways.
Tracked vehicles
Some
tank
A tank is an armoured fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armour, and good battlefield mobility provided by tracks and a powerful engin ...
s and other
tracked vehicles have bogies as external suspension components (see
armoured fighting vehicle suspension). This type of bogie usually has two or more road wheels and some type of sprung suspension to smooth the ride across rough terrain. Bogie suspensions keep much of their components on the outside of the vehicle, saving internal space. Although vulnerable to
antitank
Anti-tank warfare originated from the need to develop technology and tactics to destroy tanks during World War I. Since the Triple Entente deployed the first tanks in 1916, the German Empire developed the first anti-tank weapons. The first de ...
fire, they can often be repaired or replaced in the field.
Articulated bogie
![Sprinter-bogie+articulation](https://upload.wikimedia.org/wikipedia/commons/1/1a/Sprinter-bogie%2Barticulation.jpg)
An articulated bogie is any one of a number of bogie designs that allow
railway
Rail transport (also known as train transport) is a means of transport that transfers passengers and goods on wheeled vehicles running on rails, which are incorporated in tracks. In contrast to road transport, where the vehicles run on a pre ...
equipment to safely turn sharp corners, while reducing or eliminating the "screeching" normally associated with metal wheels rounding a bend in the rails. There are a number of such designs, and the term is also applied to train sets that incorporate articulation in the vehicle, as opposed to the bogies themselves.
If one considers a single bogie "up close", it resembles a small rail car with axles at either end. The same effect that causes the bogies to rub against the rails at longer radius causes each of the pairs of wheels to rub on the rails and cause the screeching. Articulated bogies add a second pivot point between the two
axle
An axle or axletree is a central shaft for a rotating wheel or gear. On wheeled vehicles, the axle may be fixed to the wheels, rotating with them, or fixed to the vehicle, with the wheels rotating around the axle. In the former case, bearing ...
s (
wheelsets) to allow them to rotate to the correct angle even in these cases.
Articulated lorries (tractor-trailers)
In
trucking
Road transport or road transportation is a type of transport using roads. Transport on roads can be roughly grouped into the transportation of goods and transportation of people. In many countries licensing requirements and safety regulations e ...
, a bogie is the subassembly of axles and wheels that supports a
semi-trailer
A semi-trailer is a trailer without a front axle. In the United States, the term is also used to refer to the combination of a truck and a semi-trailer; a tractor-trailer.
A large proportion of a semi-trailer's weight is supported by a tracto ...
, whether permanently attached to the frame (as on a single trailer) or making up the
dolly that can be hitched and unhitched as needed when hitching up a second or third semi-trailer (as when
pulling doubles or
triples).
Bogie (aircraft)
Radial steering truck
Radial steering trucks, also known as radial bogies, allow the individual axles to align with curves in addition to the bogie frame as a whole pivoting. For non-radial bogies, the more axles in the assembly, the more difficulty it has negotiating curves, due to
wheel flange to rail friction. For radial bogies, the wheel sets actively "steer" through curves, thus reducing wear at the
wheel flange to rail interface and improving adhesion.
In the USA, this has been implemented for locomotives both by
EMD and
GE. The EMD version, designated HTCR, was made standard equipment for the
SD70 series, first sold in 1993. However, the HTCR in actual operation had mixed results and relatively high purchase and maintenance costs. Thus EMD introduced the HTSC truck in 2003, which basically is the HTCR stripped of radial components. GE introduced their version in 1995 as a buyer option for the
AC4400CW and later
Evolution Series locomotives. However it also met with limited acceptance due to relatively high purchase and maintenance costs, and customers have generally chosen GE Hi-Ad standard trucks for newer and rebuilt locomotives.
File:CP9112 SD90MAC.jpg, EMD HTCR radial steering trucks on an EMD SD9043MAC
File:FSRR 01.jpg, GE radial steering trucks on a GE AC4400CW
The GE AC4400CW, sometimes referred as "AC44CW" is a diesel-electric locomotive that was built by GE Transportation Systems between 1993 and 2004. It is like the Dash 9-44CW, but features AC traction motors instead of DC, with a separate invert ...
See also
Articles on bogies and trucks
*
Arnoux system
The Arnoux system is a train articulation system, for turning on railroad tracks, invented by Jean-Claude-Républicain Arnoux and patented in France in 1838. Arnoux was the chief engineer of the Ligne de Sceaux which was originally built with very ...
*
Bissel bogie
A Bissell or Bissel truck (also Bissel bogie or Pony truck) is a single-axle bogie which pivots towards the centre of a steam locomotive to enable it to negotiate curves more easily. Invented in 1857 by and usually then known as a ''pony truck'' ...
*
Blomberg B
The Blomberg B is a 2-axle bogie that was introduced by EMD in 1939 with the FT locomotive series; the original "B" version plus later "M" and "X" versions were quite successful and became standard equipment on a multitude of locomotive models ...
*
Gölsdorf axle
The Gölsdorf axle system is used on railway Gölsdorf locomotives to achieve quiet running and low wear-and-tear when negotiating curves. The axle system comprises a combination of fixed axles and axles that can slide transversely, all within a si ...
*
ICF Bogie
*
Jacobs bogie
Jacobs bogies (named after Wilhelm Jakobs,, 1858–1942, a German mechanical railway engineer) are a type of rail vehicle bogie commonly found on articulated railcars and tramway vehicles.
Instead of being underneath a piece of rolling stock, ...
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Krauss-Helmholtz bogie
A Krauss-Helmholtz bogie (''Krauss-Helmholtz-Lenkgestell'') is a mechanism used on steam locomotives and some electric locomotives to improve curve running.
Operation
The bogie comprises a carrying axle connected to a coupled axle via a s ...
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Lateral motion device
A lateral motion device is a mechanism used in some railroad locomotives which permits the axles to move sideways relative to the frame. The device facilitates cornering.
Purpose
Prior to the introduction of the lateral motion device, the coupled ...
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Mason Bogie
Mason Bogie locomotives (also known as Mason Fairlie locomotives) are a type of articulated steam locomotive suited for sharp curves and uneven track, once commonly used on narrow gauge railways in the United States of America. The design is a de ...
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Pony truck
A Bissell or Bissel truck (also Bissel bogie or Pony truck) is a single-axle bogie which pivots towards the centre of a steam locomotive to enable it to negotiate curves more easily. Invented in 1857 by and usually then known as a ''pony truck' ...
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Rocker-bogie
The rocker-bogie system is the suspension arrangement developed in 1988 for use in NASA's Mars rover ''Sojourner'', and which has since become NASA's favored design for rovers. It has been used in the 2003 Mars Exploration Rover mission robots ' ...
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Scheffel bogie
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Schwartzkopff-Eckhardt II bogie
A Schwartzkopff-Eckhardt II bogie (Schwartzkopff-Eckhardt-II-Lenkgestell or Schwartzkopff-Eckhardt-Gestell) is a mechanical device to improve the curve running of steam locomotives.
The Schwartzkopff-Eckhardt II bogie is a further refinement of th ...
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Syntegra
Related topics
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Caster
A caster (or castor) is an undriven wheel that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved.
Casters are used in numerous applications, including shopping carts, office chairs, t ...
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Dolly
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Flange
A flange is a protruded ridge, lip or rim (wheel), rim, either external or internal, that serves to increase shear strength, strength (as the flange of an iron beam (structure), beam such as an I-beam or a T-beam); for easy attachment/transfer of ...
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List of railroad truck parts
A bogie or railroad truck holds the wheel sets of a rail vehicle.
Axlebox
An ''axle box'', also known as a ''journal box'' in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; ...
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Luttermöller axle A Luttermöller axle is an unusual steam locomotive component. Steam locomotives with several axles or Wheelset (rail transport), wheelsets connected to one another by coupling rods are not able to negotiate tight curves well. In order to assist suc ...
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Road–rail vehicle
A road–rail vehicle or a rail–road vehicle is a dual-mode vehicle which can operate both on rail tracks and roads. They are also known as two-way vehicles (german: Zweiwegefahrzeug), hi-rail (from ''highway'' and ''railway'', or variations ...
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Skateboard truck
A skateboard is a type of sports equipment used for skateboarding. They are usually made of a specially designed 7-8 ply maple plywood deck and polyurethane wheels attached to the underside by a pair of skateboarding trucks.
The skateboarder ...
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Spring (device)
A spring is an elastic object that stores mechanical energy. In everyday use the term often refers to coil springs, but there are many different spring designs. Modern springs are typically manufactured from spring steel, although some non- ...
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Timmis system
Timmis was an innovative design of double coiled springs, originally used for railway rolling stock, such as on the Barsi Light Railway c1889, as formulated by Everard Calthrop (1857–1927).
Inventor
The inventor was Illius Augustus Timmis
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, an early form of coil spring used on railway axles.
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Trailing wheel
On a steam locomotive, a trailing wheel or trailing axle is generally an unpowered wheel or axle ( wheelset) located behind the driving wheels. The axle of the trailing wheels is usually located in a trailing truck. On some large locomotives, ...
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Wheel arrangement
In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. Several notations exist to describe the wheel assemblies of a locomotive by type, position, and c ...
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Wheelbase
In both road and rail vehicles, the wheelbase is the horizontal distance between the centers of the front and rear wheels. For road vehicles with more than two axles (e.g. some trucks), the wheelbase is the distance between the steering (front ...
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Wheelset
References
Further reading
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External links
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Truck (bogie) with tyres Track modellingBarber truck partsSuspension systemsLocomotive’s Bogies & Components
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Locomotive parts
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