 HSTs were originally identified as Class 253 (seven trailer cars) used on the GWML and Class 254 (eight trailer cars) used on the ECML.The InterCity 125 is used on numerous intercity services today while the tilting trains it was supposed to complement and ultimately be replaced by only began to appear on British railways in the early 2000s.However, the aim for the Advanced Passenger Train was to achieve 155 mph (250 km/h) running.