In the Mid 1990s the WCML infrastructure was a complete and utter wreck, some of the original electrification structure was still there. With or without ERTMS, EPS or Virgin Trains the WCML would of need some form of Modernisation. In 1997s Richard Branson had big ideas...
The original project would of brought speeds of up to 140mph because of Pendolinos and the original project been designed with Cab Signalling (ERTMS) in Pendolinos, hence the big gap in the middle of the Main Panel in the Cab. ERTMS would of meant trains been able to run faster because of direct signalling communication to the driver rather than via Lineside Signals.
Railtrack, who at the time under bad management and then suffered Hatfield Accident slimmed down the project and scrapped the ERTMS but left the EPS (Enhanced Permissible Speed) tilt to me and you to allow some benefits from the project. A major rescheduling was made and £2b costs were cut.
In late 2003, EPS operation was successfully in the operation south of Crewe to Hemel Hempstead. After this EPS Operation was fully in operation on the Manchester route cutting journey times by 15 - 25 minutes.
In December 2007, Network Rail and Virgin are hoping for 135 mph operation along the Trent Valley Section, Stafford - Rugby as this section is relatively Straight. This all depends on Signalling Block Lengths etc.
The route still has 110mph Non-Tilt operation in use but the only parts, the WCML is very curvy in places and the line speed sometimes does not pass 95mph for Non-Tilt Trains.