The Post Office Railway is a 2ft  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.
#narrowgauge #railway #royalmail #trains