BR CL.370 Adv.Pass.Train TRBSHOR R40210A Hornby BR, Class 370 Advanced Passenger Train 2 car TRBS Coach Pack, 48403 & 48404 Era 7 2022 Catalogue British Rail's Class 370 tilting trains, also referred to as APT P (Advanced Passenger Train Prototype), were the pre production Advanced Passenger Train units. The APT P is the most powerful domestic train to have operated in Britain, setting the UK rail speed record of 162. 2 miles per hour in 1979, a record that stood for 23 years.