The Watford DC line is a suburban line from London Euston to Watford Junction in Watford, Hertfordshire. Its services are operated by London Overground. The line runs beside the West Coast Main Line (WCML) for most of its length. The London Underground Bakerloo line shares the section of the line from Queen's Park to Harrow & Wealdstone. The rolling stock used on the line are Class 710 "Aventras" made by Bombardier.