Holloway Road is a station on the London Underground. It is on the Piccadilly line between Caledonian Road and Arsenal stations, and in Travelcard Zone 2. The station opened on 15 December 1906. The station was constructed by the Great Northern, Piccadilly and Brompton Railway and was built with two lift shafts, but only one was ever used for lifts. The second shaft was the site of an experimental spiral escalator which was built by the American inventor of escalators, Jesse W. Reno.