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The British Rail Class 373 or TGV TMST train is an electric multiple unit that operate Eurostar high speed rail services from London to France and Belgium via the Channel Tunnel, part of the TGV family, it has a smaller cross-section to fit the smaller loading gauge in Britain, was originally able to operate on the UK third rail network and it has extensive fireproofing in case of fire in the tunnel. It is both the second longest—387 metres (1,270 ft)—and second fastest train in regular UK passenger service, operating at speeds of up to 300 kilometres per hour (186 mph). It is beaten in both aspects by the Class 374 (E320) which is 400 metres (1,300 ft) long and has a top speed of 320 kilometres per hour (199 mph),though this is never achieved on HS1 in Britain. Known as the TransManche Super Train (TMST) or Cross-channel Super Train before entering service in 1993, the train is designated Class 373 under the British TOPS classification system and series 373000 TGV in France. It was built by the French company GEC-Alsthom at its sites in La Rochelle (France), Belfort (France) and Washwood Heath (Britain) and by Brugeoise et Nivelles (BN, now part of Bombardier Transportation) in Bruges (Belgium). Since the delivery of the new Class 374 E320 units from Siemens in 2014, refurbished examples of the Class 373 or TGV-TMST sets have been officially dubbed as E300s by Eurostar to distinguish them from the new Velaro fleet.