[holding answer 17 October 2008]: The following table provides the information requested:
Percentage of total route kilometres open to passenger traffic that are electrified 1978 26 1988-89 31 1998-99 34 2006-071 37 1 Latest year for which figures are available. Source: Transport Statistics Great Britain 2007.
The Department for Transport is working closely with the rail industry to examine the case for extending the electrified network.