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In page Severn Beach line:

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With the coming upgrade to the Great Western Main Line, the main line from London to Bristol was due to be electrified by 2016;[11] however, delays and cost overruns led to removal of Temple Meads from the programme.[12] The electrification was not planned to extend beyond the main lines, so the Severn Beach line will continue to be served by diesel trains.[13] Stephen Williams, MP for Bristol West, questioned whether electrification could continue to Clifton Down. Secretary of State for Transport Philip Hammond replied that it would have to be looked at in the future.[14] Friends of Suburban Bristol Railways (FOSBR) supports the electrification of the entire Severn Beach line.[15]