 The 225s were therefore limited to and have been ever since.In the early 2000s, a number of train operating companies introduced diesel multiple units (DMUs) capable of 125 mph (201 km/h) speeds, including the Adelante, Voyager, Super-Voyager and Meridian/Pioneer units.In 2002, Virgin Trains introduced a new high-speed service on the West Coast Main Line with a fleet of 53 custom-designed Pendolino trains.