Alterations at Hainault included a new island platform on the west side of the station to allow the bulk of services via Gants Hill to be terminated here as well as allowing access to Hainault Depot. This, situated to the north of the station, is the major train depot on the eastern end of the line. The depot building was completed in 1939 but was used by the US Army Transportation Corps until 1945. The depot was in use for Central line stock from 14 December 1947.