Harrow-on-the-Hill station Harrow-on-the-Hill station Harrow-on-the-Hill is a London Underground station served by the Metropolitan line and National Rail services, in Travelcard Zone 5. The stations two exits are located between College Road and Lowlands Road in the Greenhill area of Harrow, about half a mile north of the locality from which it takes its name. This is where the branch from Uxbridge joins the main line and where fast and slow lines are divided. The station is the junction of four LU tracks from Baker Street (paired by direction), two Network Rail tracks from Marylebone, four LU tracks (paired by speed) to
London Underground GN&C Stock Heath. These plans were curtailed by World War II and the Northern City line (or "Highbury Branch") continued operating with 1938 Stock until 1975, when the line was transferred to British Rail. Since 1976 the line has been operated exclusively by British Rail Class 313 electric multiple units. London Underground GN&C Stock The GN & C Stock was operated on the Great Northern and City Railway, an underground railway line in London, England. It was opened between Moorgate and Finsbury Park on 14 February 1904. The original GN&C Stock operated on the line between 1904 and 1939. The line was