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Caledonian Railway 956 Class
The Caledonian Railway 956 Class were 3-cylinder 4-6-0 steam locomotives that were used on the Caledonian Railway from 1921. They were built to the design of William Pickersgill. At the time they were the largest design operated by a Scottish railway. Introduction The class ran to four members: source: BritishSteam Dimensions * Taper boiler, maximum diameter * Cylinders (3), all bore by stroke, in line with the bogie centre * As built, Walschaerts valve gear was applied directly to the outside cylinders and a form of derived motion was used for the inside one. Problems The locomotives were large and visually very impressive, but they were not successful and never really got established in traffic. One author has described them as "that monumental flop of all time", another as "ineffectual giants". Draughting was a problem from the beginning, and firemen had a lot of trouble keeping them up to pressure. There were other troubles thought to be a result of too small an a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Pickersgill
William Pickersgill (1861 – 2 May 1928) was an English railway engineer, and was chief mechanical engineer of the Caledonian Railway from 1914 until Grouping in 1923. He was appointed locomotive superintendent of the Northern Division of the London, Midland and Scottish Railway but retired in 1925. He died in Bournemouth. Career Great Eastern Railway Pickersgill was born in Nantwich, Cheshire. He started work on the Great Eastern Railway at Stratford in 1876, where he was a Whitworth Exhibitioner, and after several posts in the running department he was appointed district locomotive superintendent in Norwich in 1891. Great North of Scotland Railway In 1894, he succeeded James Johnson as the locomotive superintendent of the Great North of Scotland Railway, where he continued to develop the 4-4-0 type for that railway and was responsible for the new locomotive works at Inverurie which replaced the unsatisfactory premises at Kittybrewster. He was chairman of the Associat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gresley Conjugated Valve Gear
The Gresley conjugated valve gear is a valve gear for steam locomotives designed by Sir Nigel Gresley, chief mechanical engineer of the LNER, assisted by Harold Holcroft. It enables a three-cylinder locomotive to operate with only the two sets of valve gear for the outside cylinders, and derives the valve motion for the inside cylinder from them by means of levers (the "2 to 1 lever" and "equal lever"). The gear is sometimes known as the Gresley-Holcroft gear, acknowledging Holcroft's major contributions to its development. Operation The Gresley conjugated gear is effectively an adding machine, where the position of the valve for the inside cylinder is the sum of the positions of the two outside cylinders, but reversed in direction. It can also be thought of as a rocking lever between one outside cylinder and the inside cylinder, as is common on 4-cylinder steam locomotives, but with the pivot point being moved back and forth by a lever from the other outside cylinder. If w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Railway Locomotives Introduced In 1921
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 prepared flat surface, rail vehicles (rolling stock) are directionally guided by the tracks on which they run. Tracks usually consist of steel rails, installed on sleepers (ties) set in ballast, on which the rolling stock, usually fitted with metal wheels, moves. Other variations are also possible, such as "slab track", in which the rails are fastened to a concrete foundation resting on a prepared subsurface. Rolling stock in a rail transport system generally encounters lower frictional resistance than rubber-tyred road vehicles, so passenger and freight cars (carriages and wagons) can be coupled into longer trains. The operation is carried out by a railway company, providing transport between train stations or freight customer facili ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caledonian Railway Locomotives
Caledonian is a geographical term used to refer to places, species, or items in or from Scotland, or particularly the Scottish Highlands. It derives from Caledonia, the Roman name for the area of modern Scotland. Caledonian is also used to refer to places or people in or from New Caledonia. Caledonian may also refer to: Transport * ''Caledonian'' (ship), several ships with the name * Caledonian (locomotive), an early locomotive of the Liverpool and Manchester Railway * The Caledonian, discontinued British passenger train * Caledonian Airways, former Scottish airline * Caledonian Canal, between Inverness and Fort William, Scotland * Caledonian Railway, former Scottish railway company * Caledonian Railway (Brechin), preserved steam railway * Caledonian Road (other), the name of several places in London, England * Caledonian Sleeper, a sleeper train service in Scotland Sports * Caledonian F.C., former football club from Inverness * Inverness Caledonian Thistle F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Locomotives Of The Caledonian Railway
Locomotives of the Caledonian Railway. The Caledonian Railway Locomotive Works were originally at Greenock but moved to St. Rollox, Glasgow, in 1856. The locomotive classes are listed under the names of the railway's Chief Mechanical Engineers. Locomotives The class number used for Caledonian Railway engines was the stock number of the first member of the class to reach traffic. Hence earlier numbered classes could well have appeared later in time. Until the appointment of Dugald Drummond, unlike most other British railways, almost all engines had outside cylinders, and the 0-6-0 arrangement was quite rare, goods engines being of type 2-4-0 or 0-4-2. Passenger engines were normally 2-2-2. Robert Sinclair 1847-1856 Benjamin Conner 1856-1876 George Brittain 1876-1882 Dugald Drummond 1882-1890 Hugh Smellie 1890 Appointed 1 September 1890. Died 19 April 1891. John Lambie 1891-1895 Unless otherwise stated these were all built at the Caledonian Railway's St. Rollox railw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London Midland And Scottish Railway
The London, Midland and Scottish Railway (LMSIt has been argued that the initials LMSR should be used to be consistent with LNER, GWR and SR. The London, Midland and Scottish Railway's corporate image used LMS, and this is what is generally used in historical circles. The LMS occasionally also used the initials LM&SR. For consistency, this article uses the initials LMS.) was a British railway company. It was formed on 1 January 1923 under the Railways Act of 1921, which required the grouping of over 120 separate railways into four. The companies merged into the LMS included the London and North Western Railway, Midland Railway, the Lancashire and Yorkshire Railway (which had previously merged with the London and North Western Railway on 1 January 1922), several Scottish railway companies (including the Caledonian Railway), and numerous other, smaller ventures. Besides being the world's largest transport organisation, the company was also the largest commercial enter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caledonian Railway 60 Class
The Caledonian Railway 60 Class were 4-6-0 passenger engines designed by William Pickersgill and introduced in 1916. Six were built by the Caledonian Railway at its own St. Rollox works in 1916–17, and all of them passed into LMS LMS may refer to: Science and technology * Labeled magnitude scale, a scaling technique * Learning management system, education software * Least mean squares filter, producing least mean square error * Leiomyosarcoma, a rare form of cancer * Lenz ... ownership in 1923. A further twenty locomotives of a slightly modified design were built by the LMS under the auspices of George Hughes in the period of 1925–1926. The 60 Class were rugged and free steaming, but were unsophisticated and of lethargic performance for their size. Although classified as passenger locomotives by the LMS, latterly they spent much of their time on goods trains and acquired the nickname Greybacks, either in reference to their long and grimy boilers or possibly as an insu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dashpot
A dashpot, also known as a damper, is a mechanical device that resists motion via viscous friction. The resulting force is proportional to the velocity, but acts in the opposite direction, slowing the motion and absorbing energy. It is commonly used in conjunction with a spring. The process and instrumentation diagram (P&ID) symbol for a dashpot is . Types The two most common types of dashpots are linear and rotary. Linear damper Linear dashpots — or linear dampers — are used to exert a force opposite to a translation movement. They are generally specified by stroke (amount of linear displacement) and damping coefficient (force per velocity). Rotary damper Similarly, rotary dampers will tend to oppose any torque applied to them, in an amount proportional to their rotational speed. Their damping coefficients will usually be specified by torque per angular velocity. One can distinguish two kinds of viscous rotary dashpots: * Vane dashpots which have a limited angular ran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stephenson Link Motion
The Stephenson valve gear or Stephenson link or shifting link is a simple design of valve gear that was widely used throughout the world for various kinds of steam engines. It is named after Robert Stephenson but was invented by his employees. Historical background During the 1830s, the most popular valve drive for steam locomotives was known as '' gab motion'' in the United Kingdom and'' V-hook motion'' in the United States. The gab motion incorporated two sets of eccentrics and rods for each cylinder; one eccentric was set to give forward and the other backwards motion to the engine and one or the other could accordingly engage with a pin driving the distribution valve by means of the gabs: - vee-shaped ends to the eccentric rods supposed to catch the rocker driving the valve rod whatever its position. It was a clumsy mechanism, difficult to operate, and only gave fixed valve events. In 1841, two employees of Robert Stephenson and Company, draughtsman William Howe and patt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cast Steel
Steel casting is a specialized form of casting involving various types of steel cast to either final/net or near-net shape. Steel castings are used when iron castings cannot deliver enough strength or shock resistance.Oberg, p. 1332 Examples of items that are steel castings include: hydroelectric turbine wheels, forging presses, gears, railroad truck frames, valve bodies, pump casings, mining machinery, marine equipment, turbocharger turbines and engine cylinder blocks. Steel castings are categorized into two general groups: carbon steels and alloy steels. Steel castability Steel is more difficult to cast than iron. It has a higher melting point and greater shrinkage rate, which requires consideration during mold design. Risers should be given more capacity to draw from as the metal cools and shrinks. Attention should be paid to the thickness of mold cavities, as thinner areas will cool quicker than thicker areas, which can create internal stress points that can lead ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cast Iron
Cast iron is a class of iron– carbon alloys with a carbon content more than 2%. Its usefulness derives from its relatively low melting temperature. The alloy constituents affect its color when fractured: white cast iron has carbide impurities which allow cracks to pass straight through, grey cast iron has graphite flakes which deflect a passing crack and initiate countless new cracks as the material breaks, and ductile cast iron has spherical graphite "nodules" which stop the crack from further progressing. Carbon (C), ranging from 1.8 to 4 wt%, and silicon (Si), 1–3 wt%, are the main alloying elements of cast iron. Iron alloys with lower carbon content are known as steel. Cast iron tends to be brittle, except for malleable cast irons. With its relatively low melting point, good fluidity, castability, excellent machinability, resistance to deformation and wear resistance, cast irons have become an engineering material with a wide range of applicatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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