The Intercity 125 was designed in just 20 months by Sir Kenneth Grange. They were supposed to be a "stop-gap" before electrification. The trains were first powered by a V12 diesel engine made by ...

Image caption, An Intercity 125 on the Colne Valley Railway The 125 holds a world speed record for the fastest diesel engine of 148 miles per hour (approx 240km per hour), achieved in November 1987.