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[[File:643HY.jpg|400px|right|thumb|643 at Highley in July 2011.]]

643 is a Gresley buffet car built at York in 1937 to diagram 167. It was one of six built for Great Eastern section excursions and cross country expresses, and is believed to have been used on fast five coach Liverpool Street-Cambridge services (known colloquially as "Beer Trains"). In common with other Gresley buffet cars of the period it had electric cooking facilities powered by large axle driven dynamos (or landlines when stationary) with an attractive art deko interior finished in Rexine; in this case gold and red. Loose seating was provided in the form of tubular chromed chairs. Sometime during the late 1950/early 1960s period it was extensively rebuilt with gas cooking, enclosed bar, and MK 1 style grey Formica interior decor, in which form it survived in BR ownership until 1977.