a London Underground station, Watford tube station, on Cassiobury Park Avenue, which is the terminus of the Metropolitan line's Watford branch. This station is planned to close in the future when the line is diverted to terminate at as part of the Croxley Rail Link project; after this, Cassiobury will be served by a new Cassiobridge tube station instead, approximately south of the current station. References Watford Suburbs in the United Kingdom