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Buffers and chain couplers (or couplings) – also known as "buffers and screw", "screw", and "screwlink" – are the de facto International Union of Railways (UIC) standard railway coupling used in the EU and UK, and on some railways in other parts of the world, such as in South America and India, on older rolling stock.
The basic type of coupling on railways following the British tradition is the buffer and chain coupling. A large chain of three links connects hooks on the adjoining wagons. These couplings followed earlier tramway practice but were made more regular. Buffers on the frame of the wagon absorbed impact loads, as the train overran a slowing ...
The Type 10 includes "horns" to aid coupling on curves and include a function to provide standardised automatic air-brake connections; the coupling horn is often visible poking out at the front of the nose of high-speed trains. For European freight, the TSIs mandate buffer and chain couplings at specified heights.
It also has vertical stability added, so that the coupling cannot fall down and damage the tracks or cause a derailment. It is compatible with the standard SA3 coupler and will have buffers needed for use with the standard buffers and chain couplers. The electric plugs would be most useful with electronically controlled pneumatic brakes. The ...
The draw chain used between each pair of vehicles includes a screw which is tightened after coupling to shorten the chain and keep the buffers pressed together. Such is known as a 'screw coupling'. Historically, coupling chains were no more than that, a short length of heavy chain (typically three links long) with no adjustment.
The C-AKv is a fully automatic coupler design, also known as the Faiveley Transpact; it is a hybrid compatible with both buffers and chain couplers and Russian SA3 couplers, intended as an option for the long delayed EU transition to center buffer couplers. C-AKv is an abbreviation of Compact Automatische Kupplung vereinfacht in German ...
Buffers and chain coupler from 1859 to 1873. [22]Johnston link-and-pin from 1873 to 1927 on Cape gauge, from 1906 on 2 ft (610 mm) narrow gauge in Natal. [23] [24]Bell-and-hook from 1902 on 2 ft (610 mm) narrow gauge in the Cape of Good Hope.
The balance lever coupling has a movable balance lever mounted transversely behind the buffer, to which a draw hook is attached on the left side of the center buffer and an eye with a screw coupling on the right side. In the center of the screw coupling is a screw with a left-hand thread on one side and a right-hand thread on the other.