There has been a locomotive works at the Southall Depot for nearly 150 years. Originally a Great Western Railway shed, it was possibly the last London steam depot, outlasting Old Oak Common and Stewarts Lane depots. The shed was accessible from the footbridge, spanning the whole set of lines, situated just off the Eastern end of the platforms. The depot was later used for DMU maintenance and as a base for the electrification programme. Currently the site, now referred to as the Southall Railway Centre, is used by three independent groups; the Great Western Railway Preservation Group, Locomotive Services Limited and West Coast Railways.