The line was upgraded, doubled and the stations rebuilt to main-line standards, allowing a through Baker Street to Verney Junction service from 1 January 1897, calling at a new station at Waddesdon Manor, a rebuilt Quainton Road, Granborough Road and Winslow Road.
Banen blev opgraderet, dobbeltsporet og stationerne ombygget til hovedbanestandard, hvorved gennemkørende drift fra Baker Street til Verney Junction begyndte 1. januar 1897, med stop ved en ny station ved Waddesdon Manor, en ombygget Quainton Road, Granborough Road og Winslow Road.