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The Watford DC line is a suburban railway line from London Euston to Watford Junction in Greater London and Hertfordshire. Its services are the Lioness line of the London Overground for the whole length of the line, and the Bakerloo line of the London Underground between Harrow & Wealdstone and Queen's Park.
The line runs beside the West Coast Main Line (WCML) for most of its length. The rolling stock used on the line are the London Overground Class 710 "Aventras" made by Bombardier and the London Underground 1972 Stock.
The "DC" in the title refers to line being electrified using direct current. This was done in the early twentieth century with conductor rails to be compatible with the four-rail system used by the Underground and, at the time, the North London Line; currently, the line uses a third rail system, with a fourth rail available on the section shared with the Bakerloo line. By contrast, the WCML uses overhead alternating current.