The InterCity 125 or High Speed Train (HST) is a diesel-powered high-speed passenger train built by British Rail Engineering Limited between 1975 and 1982. A total of 95 sets were produced, each comprising two Class 43 power cars, one at each end, and a rake of seven or eight Mark 3 coaches. The name is derived from its top operational speed of 125 mph (201 km/h). At times, the sets have been classified as British Rail Classes 253, 254 and 255.
An InterCity 125 in original British Rail livery near Chesterfield
The Blue Pullmans, which were in service between 1960 and 1973, are often seen as forerunners of the HSTs.
Class 252 prototype HST at Weston-super-Mare in 1975
An InterCity 125 about to depart Manchester Piccadilly in 1986
The Advanced Passenger Train (APT) was a tilting high speed train developed by British Rail during the 1970s and early 1980s, for use on the West Coast Main Line (WCML). The WCML contained many curves, and the APT pioneered the concept of active tilting to address these, a feature that has since been copied on designs around the world. The experimental APT-E achieved a new British railway speed record on 10 August 1975 when it reached 152.3 miles per hour (245.1 km/h), only to be surpassed by the service prototype APT-P at 162.2 miles per hour (261.0 km/h) in December 1979.
APT-E in the RTC sidings between tests in the summer of 1972
Driving controls of the Advanced Passenger Train (APT-P) at Crewe Heritage Centre.
Superelevation was applied to portions of the BR network, although the angle was limited. Here, an InterCity 225, based on APT technology, rounds a canted turn on the East Coast Main Line.