Quainton Road railway station was opened in 1868 near Quainton, in the English county of Buckinghamshire, 44 miles from London. Built by the Aylesbury and Buckingham Railway, it was the result of pressure from the 3rd Duke of Buckingham to route the railway near his home at Wotton House and to open a railway station at the nearest point to it. Serving a relatively unpopulated area, Quainton Road was a crude railway station, described as "extremely primitive". The Duke built a short horse-drawn tramway to transport goods between his estates at Wotton and a terminus adjacent to the station.
Aylesbury and Buckingham Railway and the Brill Tramway were subsequently absorbed by London's Metropolitan Railway (MR), which already operated the line between Aylesbury and London. The MR rebuilt Quainton Road and re-sited it to a more convenient location, allowing through running between the Brill Tramway and the Aylesbury and Buckingham Railway. When the Great Central Railway (GCR) from the north of England opened, Quainton Road became a significant junction at which trains from four directions met, and by far the busiest of the MR's rural stations.
In 1933 the Metropolitan Railway was taken into public ownership to become the Metropolitan Line of the London Passenger Transport Board's London Underground, including Quainton Road. The LPTB aimed to move away from freight operations, and saw no way in which the rural parts of the line could be made into viable passenger routes. In 1935 the Brill Tramway was closed. From 1936 Underground trains were withdrawn north of Aylesbury, leaving the London and North Eastern Railway (successor to the GCR) as the only operator using the station, although Underground services were restored for a short period in the 1940s. In 1963 stopping passenger services were withdrawn but fast passenger trains continued to pass through. In 1966 the line was closed to passenger traffic and local goods trains ceased using the station. The line through the station was singled and is now only used by occasional freight trains.
The site and buildings of the former Quainton Road railway station are now occupied by Buckinghamshire Railway Centre and run as a museum.
To find the cache you need to make your way south west from the recommended parking along the road to the southern end of the eastern parapet of the railway bridge. Please take care along here, especially with dogs and small people, as although there is an adequate grass verge to walk along there is no proper pavement. At the published location you need to interrogate what you find there to give you the co-ords for the final (and a hint should you need it). Remember, you will need a smartphone with appropriate app for the interrogation.
While you are on the bridge take the time to look east over the Railway Centre. This is the best view you will get without visiting the Centre, which is only open on limited days. GroundSpeak rules do not allow me to include a link to the Railway Centre web site, but a quick internet search will tell you what you need to know – which days the Centre is open, which days are Steam Days and when special excursions are running.