On 2 April 1906, the same day that the
Great Western and Great Central Joint Railway (GWGCJR) was opened, the Metropolitan and Great Central Joint Railway (MGCJR) was created. This took over the lines of the
Metropolitan Railway north and west of Harrow South Junction, with the exception of the branch to . These comprised the main line between and and the branches from to and from to . The MGCJR was created under the terms of the Metropolitan & Great Central Railway Act, which received Royal Assent on 4 August 1905. Management of the joint line was to be in alternate periods of five years by the two co-owners, the first five-year term being that of the Metropolitan. After establishment of the MGCJR, new stations were opened at in 1910, and at in 1915. was leased jointly to the MGCJR and the GWGCJR from 1907. The branch to from was authorised under an Act of Parliament obtained by the Metropolitan on 7 August 1912, but was a MGCJR project. Purchase of land began in 1914, but the
First World War held up further progress, and the first contract for construction was not placed until December 1922. At the start of 1923, the GCR was a constituent of the newly created
London and North Eastern Railway; and on 1 July 1933, the Metropolitan was a constituent of the
London Passenger Transport Board. Through both these changes of ownership, the MGCJR retained its title, and was listed in the
Transport Act 1947, which nationalised the British railways, as one of the "bodies whose undertakings are transferred to the British Transport Commission|[British Transport] Commission". In 1993,
British Rail (now Chiltern Railways) services calling at
Moor Park ceased. ==Legacy==