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The Chesham branch is a short single-track branch line in Buckinghamshire, England. Although no part of it is within London and it runs entirely above ground, it is owned and operated by the London Underground. It runs from a junction at Chalfont & Latimer with the Metropolitan line and the Chiltern Railways route to Aylesbury, and runs for 3.89 miles (6.26 km) northwest to its only other station at Chesham.

The line was built as part of Edward Watkin's scheme to turn his Metropolitan Railway (MR) into a direct rail route between London and Manchester, and it was envisaged that a station outside Chesham would be an intermediate stop on a through route running north to connect with the London and North Western Railway (LNWR). Although the relationship with the LNWR soured, it was decided to build the route as far as Chesham anyway. The line opened in 1889 and Chesham became the terminus of the MR. In 1892 the MR opened an extension to Aylesbury and on to Verney Junction and the Chesham line became a branch line. In 1933 the Metropolitan Railway became part of the London Underground. For most of its time as a branch the service operated as a shuttle, but, since the introduction of new rolling stock in 2010 the branch operates a through service to and from London. (Full article...)