Key holder hooks12/7/2022 ![]() ![]() The earliest ' dumb buffers' were fixed extensions of the wooden wagon frames, but later spring buffers were introduced. Higher speeds associated with fully-fitted freight made the screw-tensioned form a necessity. This could be turned lengthwise to lengthen it, allowing coupling, then turned vertically to the shorter slot position, holding the wagons more tightly together. While acceptable for mineral wagons, this coupling gave an uncomfortable ride for passenger coaches, and so the chain was improved by replacing the centre link with a turnbuckle that draws the vehicles together, giving the screw coupling.Ī simplified version of this, quicker to attach and detach, still used three links but with the centre link given a T-shaped slot. The simple chain could not be tensioned and this slack coupling allowed a lot of back-and-forth movement and banging between vehicles, and jarring when starting trains. Buffers on the frame of the wagon absorbed impact loads, as the train over-ran a slowing locomotive. These couplings followed earlier tramway practice but were made more regular. ![]() A large chain of three links connects hooks on the adjoining wagons. The basic type of coupling on railways following the British tradition is the buffer and chain coupling. 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. 10.1 Buckeye/Janney/MCB/ARA/AAR/APTA couplersĬompatible and similar couplings or couplers are frequently referred to using widely differing make, brand, or regional names, or nicknames, which can make describing standard or typical designs confusing. ![]()
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