At the start of the 21st Century, the Great Western Main Line was the last of the major main line routes in the UK to be using diesel trains as the main source of locomotive power, other than the Midland Main Line. When the announcement was made in July 2009 to electrify the Great Western (along with the Liverpool-Manchester line), it represented the first big rail electrification project in the UK for 20 years. The South Wales Main Line branch of the GWML is set to be the first electrified cross-country railway line in Wales.