Northwood is a station on the Watford branch of the Metropolitan line, in Travelcard Zone 6. The station is located just off the main road through the town, Green Lane. The line serves as the sole continuous link between the town of Northwood and London, key for a region known as Metro-Land. Northwood used to be a terminus for many Metropolitan trains, similar to the status of Harrow-on-the-Hill and Neasden. Some trains from London do terminate at Northwood, due to the placement of two sidings, but this usually happens when there are engineering works or delays north of Northwood.