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Tamping Dance Step
A tamping machine or ballast tamper, informally simply a tamper, is a self-propelled, rail-mounted machine used to pack (or tamp) the track ballast under railway tracks to make the tracks and roadbed more durable and level. Prior to the introduction of mechanical tampers, this task was done by manual labour with the help of beaters. As well as being faster, more accurate, more efficient and less labour-intensive, tamping machines are essential for the use of concrete sleepers since they are too heavy (usually over ) to be lifted by hand. At its most basic, a tamping machine only packs the ballast. Some modern machines, sometimes known as tamper-liners or tamping and lining machines, also correct the alignment of the rails to make them parallel and level, in order to achieve a more comfortable ride for passengers and freight and to reduce the mechanical strain applied to the rails by passing trains. This is done by finding places where the sleepers have sunk from the weight of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ballast Tamper
Ballast is material that is used to provide stability to a vehicle or structure. Ballast, other than cargo, may be placed in a vehicle, often a ship or the gondola of a balloon or airship, to provide stability. A compartment within a boat, ship, submarine, or other floating structure that holds water is called a ballast tank. Water should move in and out from the ballast tank to balance the ship. In a vessel that travels on the water, the ballast will remain below the water level, to counteract the effects of weight above the water level. The ballast may be redistributed in the vessel or disposed of altogether to change its effects on the movement of the vessel. History The basic concept behind the ballast tank can be seen in many forms of aquatic life, such as the blowfish or members of the argonaut group of octopus. The concept has been invented and reinvented many times by humans to serve a variety of purposes. In the fifteenth and sixteenth century, the ballast "did not consi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Complete Workhead
Complete may refer to: Logic * Completeness (logic) * Completeness of a theory, the property of a theory that every formula in the theory's language or its negation is provable Mathematics * The completeness of the real numbers, which implies that there are no "holes" in the real numbers * Complete metric space, a metric space in which every Cauchy sequence converges * Complete uniform space, a uniform space where every Cauchy net in converges (or equivalently every Cauchy filter converges) * Complete measure, a measure space where every subset of every null set is measurable * Completion (algebra), at an ideal * Completeness (cryptography) * Completeness (statistics), a statistic that does not allow an unbiased estimator of zero * Complete graph, an undirected graph in which every pair of vertices has exactly one edge connecting them * Complete category, a category ''C'' where every diagram from a small category to ''C'' has a limit; it is ''cocomplete'' if every such functor ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plasser American
Plasser & Theurer is an Austrian manufacturer of rail track maintenance and track laying machines. It accounts for 6% of Austrian exports of the machinery and iron and steel construction industry. History The company was established in 1953 by a group of nine people. It is a privately owned company with 30% being held by Josef Theurer, 30% by his daughter Elisabeth Max-Theurer, 20% each by Dorothea Theurer and Hans-Jörg Holleis. Currently the company is active in over 100 countries. In 2019, the company appointed a new chief operating officer, Dr Daniel Siedl, as well as a new chief technical officer- Dr Winfried Büdenbender. Products Plasser & Theurer manufactures railway maintenance machines for all purposes including adjusting and tamping tracks, the installation and maintenance of overhead wires and the associated equipment. Other products include railway bridge inspection and repair vehicles and flash-butt welding machines. Clients * Belgian Railways SNCB * Bay Ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Track Centre
The track spacing is the distance between the track centres of double-track railway lines. There are standard distances derived from the standard loading gauge in a country. For high-speed trains and in tighter curves that distance needs to be increased. The track spacing is also called the ''center-to-center'' spacing to differentiate it from the ''edge-to-center'' spacing of a railway. These two values may be different depending on how signal masts are added to the overall track geometry. Description The distance between the track centres makes a difference in cost and performance of a double-track line. The track centres can be as narrow and as cheap as possible, but maintenance must be done on the side. Signals for bi-directional working cannot be mounted between the tracks so must be mounted on the 'wrong' side of the line or on expensive signal bridges. Track centres are usually wider on high-speed lines, as pressure waves knock each other as high-speed trains pass. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diamond Crossing
A double junction is a railway junction where a double-track railway splits into two double track lines. Usually, one line is the main line and carries traffic through the junction at normal speed, while the other track is a branch line that carries traffic through the junction at reduced speed. A number of configurations are possible. At grade Diamond The simplest and oldest arrangement consists of two turnouts (points) and a fixed Diamond crossing. Because the diamond needs to be relatively coarse, say 1 in 8, the curve radius is necessarily small, leading to a speed of perhaps . This type of junction is common on street-running tramways, where speeds are quite low and junction must fit into the available road space. Because the points are close together, the entire junction can be controlled by the mechanical point rodding of a single signal box. Signal passed at danger (SPAD) protection — A train from R to P with 12 points reverse is protected from a train from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 type of switch consists of a pair of linked tapering rails, known as ''points'' (''switch rails'' or ''point blades''), lying between the diverging outer rails (the ''stock rails''). These points can be moved laterally into one of two positions to direct a train coming from the point blades toward the straight path or the diverging path. A train moving from the narrow end toward the point blades (i.e. it will be directed to one of the two paths, depending on the position of the points) is said to be executing a ''facing-point movement''. For many types of switch, a train coming from either of the converging directions will pass through the switch regardless of the position of the points, as the vehicle's wheels will force the points to move. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northam, Western Australia
Northam () is a town in the Australian state of Western Australia, situated at the confluence of the Avon and Mortlock Rivers, about east-northeast of Perth in the Avon Valley. At the 2016 census, Northam had a population of 6,548. Northam is the largest town in the Avon region. It is also the largest inland town in the state not founded on mining. History The area around Northam was first explored in 1830 by a party of colonists led by Ensign Robert Dale, and subsequently founded in 1833. It was named by Governor Stirling, probably after a village of the same name in Devon, England. Almost immediately it became a point of departure for explorers and settlers who were interested in the lands which lay to the east. This initial importance declined with the growing importance of the nearby towns of York and Beverley, but the arrival of the railway made Northam the major departure point for prospectors and miners heading east towards the goldfields. A number of older b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perth
Perth is the capital and largest city of the Australian state of Western Australia. It is the fourth most populous city in Australia and Oceania, with a population of 2.1 million (80% of the state) living in Greater Perth in 2020. Perth is part of the South West Land Division of Western Australia, with most of the metropolitan area on the Swan Coastal Plain between the Indian Ocean and the Darling Scarp. The city has expanded outward from the original British settlements on the Swan River, upon which the city's central business district and port of Fremantle are situated. Perth is located on the traditional lands of the Whadjuk Noongar people, where Aboriginal Australians have lived for at least 45,000 years. Captain James Stirling founded Perth in 1829 as the administrative centre of the Swan River Colony. It was named after the city of Perth in Scotland, due to the influence of Stirling's patron Sir George Murray, who had connections with the area. It gained city statu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dual Gauge
In railway engineering, "gauge" is the transverse distance between the inner surfaces of the heads of two rails, which for the vast majority of railway lines is the number of rails in place. However, it is sometimes necessary for track to carry railway vehicles with wheels matched to two different gauges. Such track is described as dual gauge – achieved either by addition of a third rail, if it will fit, or by two additional rails. Dual-gauge tracks are more expensive to configure with signals and sidings, and to maintain, than two separate single-gauge tracks. It is therefore usual to build dual-gauge or other multi-gauge tracks only when necessitated by lack of space or when tracks of two different gauges meet in marshalling yards or passenger stations. Dual-gauge tracks are by far the most common configuration, but triple-gauge tracks have been built in some situations. Background The rail gauge is the most fundamental specification of a railway. Rail tracks and whee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Railway Tie
A railroad tie, crosstie (American English), railway tie ( Canadian English) or railway sleeper (Australian and British English) is a rectangular support for the rails in railroad tracks. Generally laid perpendicular to the rails, ties transfer loads to the track ballast and subgrade, hold the rails upright and keep them spaced to the correct gauge. Railroad ties are traditionally made of wood, but prestressed concrete is now also widely used, especially in Europe and Asia. Steel ties are common on secondary lines in the UK; plastic composite ties are also employed, although far less than wood or concrete. As of January 2008, the approximate market share in North America for traditional and wood ties was 91.5%, the remainder being concrete, steel, azobé (red ironwood) and plastic composite. Tie spacing may depend on the type of tie, traffic loads and other requirements, for example 2640 concrete ties per mile on North American mainline railroads to 2112 timber ties per mil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glenbrook Tunnel (1913)
The Glenbrook Tunnel is a double-track railway tunnel located on the Main Western Line, near Glenbrook, in the City of Blue Mountains local government area of New South Wales, Australia. The property is owned by RailCorp, an agency of the Government of New South Wales. The railway tunnel is part of the Glenbrook 1913 double-track deviation, which replaced the Glenbrook 1892 single-track deviation across the Blue Mountains. The tunnel is long and was officially opened on 11 May 1913. Description At , the 1913 tunnel was shorter than the 1892 Glenbrook Tunnel. However, the 1913 deviation was approximately longer than the 1892 deviation. The 1913 deviation did not improve the time taken to climb or descend the pass between Emu Plains and Blaxland stations, however a reduction in gradient from 1:30 to 1:60 made the pass more manageable and reduced challenges with steam locomotives in tunnels on significant gradients, including reducing the possibility of suffocation. Init ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
_track%2C_South_Australian_Railways.jpg "Click for more on -> Dual Gauge")
