and Princes Risborough, which was transferred to the Joint Committee at its establishment on 1 August 1899. The line was extended in a north-westerly direction to Ashendon Junction, at which point the joint line ended, and a GCR route ran northwards to Grendon Underwood Junction, just south of ; both sections opened for goods on 20 November 1905, and for passengers on 2 April 1906. Continuing in the same north-westerly direction from Ashendon Junction, the Bicester cut-off line, which was purely GWR property, was opened for goods trains on 4 April 1910, and to passengers on 1 July 1910. The branch closed to passengers on 1 July 1957, and the route to Oxford via Thame closed on 7 January 1963; services over the GCR route ceased on 5 September 1966, leaving the present network of two lines to the north, to and to Aylesbury. The station was transferred from the Western Region of British Rail to the London Midland Region on 24 March 1974. Chiltern Railways considered reinstating the Wycombe Railway's Oxford extension via Thame, but instead constructed a chord at Bicester to permit services to run from the main line onto the westernmost section of the Varsity Line, restored between Bicester and Oxford; this permitted a new service to Oxford which opened in 2015. Part of the Watlington branch line has been reopened by the Chinnor and Princes Risborough Railway, which extended its heritage railway service to a new platform face at Princes Risborough station on the site of the former platform to Watlington, Platform 4; although the platform opened in August 2018, the platform as well as the Railway is still being maintained. Princes Risborough station currently has four platforms: Platform 1 for Aylesbury; Platform 2 from Aylesbury to London (via High Wycombe); Platform 3 for Bicester, Banbury, Oxford and Birmingham; and Platform 4 for the Chinnor and Princes Risborough Heritage Railway. Originally, two through roads allowed non-stop running clear of the platform roads. Radical cuts on the Chiltern Main Line and Great Central Main Line in the 1960s left the station with only two usable platforms - the current platforms 1 and 2. In 1998 to increase capacity on the line Chiltern Railways reinstated platform 3, the down platform, on top of the old down platform road, in a manner similar to that at West Ruislip. Fragments of the original down platform are still visible at the