Lobbying from residents and businesses in the nearby town of Brill led to an extension being built in 1872 from Wotton to Brill railway station, at the foot of Brill Hill three-quarters of a mile (1.2 km) from the hilltop town of Brill itself. Two mixed trains each day were introduced in each direction, and the line was renamed the Brill Tramway. The Duke bought two Aveling and Porter traction engines modified to work as locomotives for the line, each with a top speed of , although a speed limit of was enforced. The Duke died in 1889, and in 1894 the trustees of his estate set up the Oxford & Aylesbury Tramroad Company (O&ATC) with the intention of extending the line from Brill to Oxford. On 1 September 1894 London's Metropolitan Railway (MR) reached Aylesbury, and shortly afterwards connected to the A&BR line, with local MR services running via Quainton Road to Verney Junction from 1 April 1894. Through trains from the MR's London terminus at Baker Street commenced on 1 January 1897. From 1 December 1899 the MR leased the Brill Tramway from the O&ATC and took over the operation of services on the line, although the Tramway continued to be owned by the O&ATC. Waddesdon Road was the first station out from the Quainton Road junction station, in open countryside immediately north of Akeman Street (the A41 road after 1919), about southeast of Quainton Road, northwest of the town of Waddesdon, and from Waddesdon Manor. The station was initially built with a single low wooden platform, primarily intended for loading and unloading freight. After the 1899 transfer of services to the Metropolitan Railway, the MR introduced a single Brown Marshall passenger carriage on the line; at this time, a short section of platform was raised to conventional height to allow access to the higher doors on the new carriage. Initially known as "Waddesdon Road Siding", the station was renamed "Waddesdon" shortly after opening. On 1 October 1922 the nearby Waddesdon Manor railway station, on the Metropolitan Railway southeast of Quainton Road, was renamed "Waddesdon" and the former Waddesdon station was renamed "Waddesdon Road" in an effort to reduce confusion. The station was heavily used during the construction of Baron Ferdinand de Rothschild's estate at Waddesdon Manor in the 1870s and 1880s.