From Wikipedia : Watford Junction is a railway station serving the town of Watford in Hertfordshire, England. The station is on the West Coast Main Line (WCML), 17 miles 34 chains (28 km) from London Euston and the Abbey Line, a branch line to St Albans. It is also the northern terminus of the Lioness line of the London Overground, which operates via the Watford DC line into central London.