Brill railway station was the terminus of a small railway line in Buckinghamshire, known as the Brill Tramway. Built and owned by the Duke of Buckingham, it was later operated by London's Metropolitan Railway, and in 1933 briefly became one of the two north-western termini of the London Underground, despite being 45 miles (72 km) and over two hours travelling time from the City of London.
It opened 1872, was taken over by the Metropolitan Line 1899, and closed 1935.
More information on the Wikipedia page [1]. There are a number of videos on the station.
For the station on the Chiltern Main Line which served the same area, see Brill and Ludgershall railway station.