A bogie comprises two or more wheelsets, in a frame, attached under a vehicle by a pivot. Bogies take various forms in various modes of transport. A bogie may remain normally attached or be quickly detachable. It may include suspension components within it, or be solid and in turn be suspended. It may be mounted on a swivel, as traditionally on a railway carriage or locomotive, additionally jointed and sprung, or held in place by other means.
In rail transport, track gauge 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 different track gauges exist worldwide, gauge differences often present a barrier to wider operation on railway networks.
Talgo is a Spanish manufacturer of intercity, standard, and high-speed passenger trains. Talgo is an abbreviation of Tren Articulado Ligero Goicoechea Oriol.
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.
With railways, a break of gauge occurs where a line of one track gauge meets a line of a different gauge. Trains and rolling stock generally cannot run through without some form of conversion between gauges, leading to passengers having to change trains and freight requiring transloading or transshipping; this can add delays, costs, and inconvenience to travel on such a route.
The SZD Class AA20 was a one-off experimental 4-14-4 steam locomotive constructed by the Soviet Union by Krupp and the Voroshilovgrad Locomotive Factory in 1934 for the Sovetskie Zheleznye Dorogi (SŽD). Two locomotives were set to be built, but due to the construction of the railway's more powerful FD Class, AA20-1 was built, leaving the second AA20 incomplete.
An adhesion railway relies on adhesion traction to move the train, and is the most widespread and common type of railway in the world. Adhesion traction is the friction between the drive wheels and the steel rail. Since the vast majority of railways are adhesion railways, the term adhesion railway is used only when it is necessary to distinguish adhesion railways from railways moved by other means, such as by a stationary engine pulling on a cable attached to the cars or by a pinion meshing with a rack.
Hunting oscillation is a self-oscillation, usually unwanted, about an equilibrium. The expression came into use in the 19th century and describes how a system "hunts" for equilibrium. The expression is used to describe phenomena in such diverse fields as electronics, aviation, biology, and railway engineering.
Rollbocks, sometimes called transporter trailers, are narrow gauge railway trucks or bogies that allow a standard gauge wagon to 'piggyback' on a narrow-gauge line. The Vevey system enables a coupled train of standard gauge wagons to be automatically loaded or rolled onto Rollbocks, so that the train can then continue through a change of gauge.
A wheelset is a pair of railroad vehicle wheels mounted rigidly on an axle allowing both wheels to rotate together. Wheelsets are often mounted in a bogie – a pivoted frame assembly holding at least two wheelsets – at each end of the vehicle. Most modern freight cars and passenger cars have bogies each with two wheelsets, but three wheelsets are used in bogies of freight cars that carry heavy loads, and three-wheelset bogies are under some passenger cars. Four-wheeled goods wagons that were once near-universal in Europe and Great Britain and their colonies have only two wheelsets; in recent decades such vehicles have become less common as trainloads have become heavier.
SeaRail is a company based in Tampere, Finland operating a logistics terminal.
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, and installing a new bogie with differently spaced wheels. It is generally limited to wagons and carriages, though the bogies on diesel locomotives can be exchanged if enough time is available.
Track gauge conversion is the changing of one railway track gauge to another. In general, requirements depend on whether the conversion is from a wider gauge to a narrower gauge or vice versa, on how the rail vehicles can be modified to accommodate a track gauge conversion, and on whether the gauge conversion is manual or automated.
5 ft 6 in (1,676 mm) is a broad track gauge, used in India, Pakistan, western Bangladesh, Sri Lanka, Argentina, Chile, and on BART in the San Francisco Bay Area.
Iberian gauge is a track gauge of 1,668 mm, most extensively used by the railways of Spain and Portugal. A broad gauge, it is the second-widest gauge in regular use anywhere in the world, with only Indian gauge railways, 5 ft 6 in, being wider.
SUW 2000 is a Polish variable gauge system that allows trains to cross a break of gauge. It is interoperable with the German Rafil Type V 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 tight radii in the area around Sceaux, Hauts-de-Seine.
The DB Class V 51 and DB Class V 52 are classes of almost identical narrow gauge 4 axle diesel hydraulic locomotives built in 1964 for the Deutsche Bundesbahn, being built for 750 mm and 1,000 mm gauge lines respectively.
The Catalan Talgo was an international express train that linked Geneva, Switzerland, with Barcelona, Spain from 1969 to 2010. It was named after the Spanish region Catalonia and the Talgo equipment it used. It was an extension and upgrading of a predecessor train, Le Catalan, a first-class-only French (SNCF) Rapide train that had been in operation since 1955 but running only between Geneva and the stations nearest the Spanish-French border, connecting with a second-class-only "autorail" trainset to and from Barcelona. The national railway network of Spain, Red Nacional de los Ferrocarriles Españoles (RENFE), was using Iberian gauge for all of its main lines, while those of France and Switzerland use standard gauge. As a result of this break-of-gauge, train journeys between Geneva and Barcelona consisted of two separate parts, with travelers having to change from a French to a Spanish train or vice versa at the border—at Portbou on southbound trains and at Cerbère on northbound trains. In 1968, this was resolved with the introduction of the Talgo III RD trainsets, which featured variable gauge wheelsets. At Portbou station, the wheel spacing of each passenger carriage was adjusted by a gauge changer for the difference in gauge, and passengers no longer had to change trains. After successful test runs, the Catalan was extended from Port Bou to Barcelona as a through train on 1 June 1969, becoming the Catalan Talgo and upgraded to a Trans Europ Express (TEE). Most other rail journeys through this border crossing continued to require a change of train at Cerbère station or at Port Bou, as most trains did not use Talgo III RD trainsets.
The GoldenPass Express is a luxury railway service that operates between Montreux, on Lake Geneva, and Interlaken, in the Bernese Oberland, in Switzerland. The train is owned and operated jointly by the Montreux Oberland Bernois Railway (MOB) and BLS AG (BLS). As such, it uses the MOB's 1,000 mm gauge line between Montreux and Zweisimmen. In Zweisimmen, the train cars change gauges in order to operate on BLS' 1,435 mm gauge lines from Zweisimmen to Spiez and then from Spiez to Interlaken. The automatic gauge changeover, which adjusts both the track gauge and the height of the car body, is believed to the first of its kind in the world when implemented on 11 December 2022.
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