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Narrow gauge flat wagons, 750 mm (2 ft 5 + 1 ⁄ 2 in).Note the single buffer with a hook on the right side and a chain on the other. On some narrow-gauge lines in Europe, and on the Paris Metro, a simplified version of the loose-coupler is used, consisting of a single central buffer with a chain underneath.
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 balance lever coupling, also central buffer coupling with two screw coupling, is a coupler commonly used on narrow gauge railroads with tight curves. By swapping the pulling and pushing devices, the standard screw coupling used on standard gauge railroads became a center buffer coupling with one screw coupling on each side of the buffer.
Dimensions and ratings noted in these articles are usually of nominal or typical components and systems, though standards and practices also vary widely with railway, region, and era. Transition between incompatible coupler types may be accomplished using dual couplings , a coupling adapter or a barrier wagon .
A master link or quick-release link is a roller chain accessory that allows convenient connection and disconnection of a chain without the need for a chain tool. [1] It acts as a set of the chain's outer plates, so joining two sets of the chain's inner plate ends. Such master links may or may not be re-usable. [2]
The balance lever coupling, also known as rocking lever coupling or compensating coupling, is a type of central buffer coupling that has found widespread use, especially in narrow-gauge railways. In Switzerland this type of coupling is called a central buffer with two screw couplings, abbreviated to Zp2, [ 1 ] or referred to as a central buffer ...
Conversion is made harder to justify because the existing buffer and chain coupling is almost universal. Meanwhile, drawgear of new rolling stock is being built at a height suitable for conversion. The proposed European C-AKv freight coupler is compatible with the SA3 coupler but adds integrated air and electrical connections.
The maximum width of 10 ft 8 in (3.25 m) on 41 ft 3 in (12.57 m) (AAR Plate B), 46 ft 3 in (14.10 m) (AAR Plate C) and all other truck centers (of all other AAR Plates) are on a 441 ft 8 + 3 ⁄ 8 in (134.63 m) radius or 13° curve. [30] [31] In all cases of the increase of truck centers, the decrease of width is covered by AAR Plates D1 and D2.
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