London Post Office Railway

About

The Post Office Railway, known since 1987 as Mail Rail, is a 2 ft (610 mm) narrow-gauge, driverless underground railway in London that was built by the Post Office with assistance from the Underground Electric Railways Company of London, to transport mail between sorting offices. Inspired by the Chicago Tunnel Company, it opened in 1927 and operated for 76 years until it closed in 2003. A museum within the former railway was opened in September 2017.