Cassiobridge is a planned London Underground station in Watford, Hertfordshire, England. The station will be on the Metropolitan line's Croxley Rail Link extension to Watford Junction. After the new line is opened Watford station will be closed to passenger services, so that all trains from Croxley will continue to Watford Junction. The station is projected to offer interchange with local transport services, and will operate as an unstaffed station, providing automatic ticketing facilities similar to a DLR station. There is also potential for Park and Ride facilities to be provided, although planning documents indicate high levels of congestion on adjacent roads.