British Rail's Class 370 tilting trains, also referred to as APT-P (meaning Advanced Passenger Train Prototype), were the pre-production Advanced Passenger Train units. Unlike the earlier experimental gas-turbine APT-E unit, these units were powered by 25 kV AC overhead electrification and were used on the West Coast Main Line between London Euston and Glasgow Central. The APT-P is the most powerful domestic train to have operated in Britain, the eight traction motors fitted to the two central motor cars giving a total output of . This enabled the train to set the UK rail speed record of in December 1979, a record that stood for 23years until broken by a Eurostar Class 373 on the newly completed High Speed 1 line. History The APT-P was unveiled to the public on 7 June 1978 and continued to be used for testing into 1986. Due to ongoing technical problems with these pre-production units, and a lack of cash or political will to take the project forward, the planned APT-S (Advanced Passenger Train Squadron Service) production-series units were never built, but did influence the design of the later InterCity 225 sets designed for the East Coast Main Line electrification. The influence is strongest with the Class 91 locos which took many features from the APT power cars. The technology was later sold to Fiat Ferroviaria and used for improving their second generation Pendolino trains which are used worldwide, including on the West Coast Main Line as the Class 390. Numbering Units were numbered 370001-370006 (plus two spare cars labelled 370007) and were formed as follows: 48101-48107 - Driving Trailer Second 48201-48206 - Trailer Second 48401-48406 - Trailer Restaurant Second Buffet 48301-48306 - Trailer Unclassified 48501-48506 - Trailer First 48601-48607 - Trailer Brake First 49001-49006 - Non-Driving Motor A full train was made up of two units running back-to-back, with the two motor cars adjoining. The motor cars had no seating accommodation or through-gangway, so the two halves of the train were unconnected for passengers. Withdrawal and preservation All six units were withdrawn during 1985–1986, and most cars were quickly scrapped. The remaining cars are exhibited at Crewe Heritage Centre, a museum located next to Crewe station. Of these, six cars are formed into a single train: 48103 - Driving Trailer Second 48404 - Trailer Restaurant Second Buffet 48603 - Trailer Brake First 49002 - Non-Driving Motor 48602 - Trailer Brake First 48106 -