London Underground L Stock London Underground L Stock London Underground L Stock was a clerestory-roofed rail stock built for the District line in 1932 and subsequently absorbed into the London Underground Q Stock, being redesignated Q31 Stock. The L Stock trains were built to provide additional rolling stock for the eastward extension of the District Line from Barking to Upminster. Two new electrified tracks were added parallel to the existing steam-operated LMS lines, including several new stations such as Upminster Bridge. Forty-five cars were built by the Union Construction Company, eight were driving motor cars and the rest were trailers. The eight motor cars,
Romford–Upminster line Romford–Upminster line The Romford–Upminster line is a railway branch line in Greater London that connects , on the Great Eastern Main Line, to , on the London, Tilbury and Southend Line and London Underground. The route is in length and there is one intermediate station at . The line is part of Network Rail Strategic Route 7, SRS 07.09, and is classified as a rural line. The line is single-track throughout, electrified at 25 kV AC, has a loading gauge of W6, and a maximum speed of . As of May 2015 services are operated by London Overground, with two