Hainault depot is a traction maintenance depot on the London Underground Central line, between Hainault and Grange Hill stations in the London Borough of Redbridge, England. Construction began in 1939, but was delayed by the onset of the Second World War, and was not completed until 1948. It has stabled three generations of trains, Standard stock, 1962 stock and 1992 stock. It has also housed trains of the experimental 1960 stock, both when it was conventionally controlled and during trials of Automatic Train Operation (ATO) in preparation for the construction of the Victoria Line. Some of the 1967 stock destined for the Victoria Line was also stabled at the depot while its ATO equipment was tested and commissioned on the Woodford to Hainault Branch.