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If the stock used has screw-link couplings, then yes - coupling two vehicles involves hooking the chain from one over the hook of the other, then turning the threaded link to pull them together (then the usual brake pipes, etc). Older stock (steam-era, though some lasted into the diesel age) used three-link couplings (as the name suggests, these were a length of chain three links long) but there were problems with the slack involved - the train crew had to be very careful to avoid broken couplings or damaged cargo. Some of the most recent equipment is fitted with US-type knuckle couplers (these were standardised for passenger stock with the BR standard designs (MK1, MK2, etc) though they were originally used by the LNER and Pullman - most cars had/have a drop-head knuckle coupler that reveals a hook behind, and retractable buffers to allow them to couple to locos and other cars without knuckles).
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