The GCR opened a short section from Neasden to South Harrow (later renamed Sudbury Hill (Harrow) from 1 March 1906. The Chalfont Viaduct was constructed 1902–1906 to cross the River Misbourne near Gerrards Cross. Passenger opening of the entire Joint Line took place on 2 April 1906; on that date stations were opened (or re-opened) at Ruislip & Ickenham, Denham, Gerrard's Cross, Beaconsfield, High Wycombe, Saunderton, Princes Risborough and Haddenham. All of the stations were laid out in lavish style, with the buildings in typical GWR designs. Greenford, Denham, Gerrard's Cross and Beaconsfield had passenger loops for the platforms.