Mail Rail at the Postal Museum

The Post Office Railway, known as Mail Rail since 1987, 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 move mail between sorting offices. Inspired by the Chicago Tunnel Company, it operated from 1927 until 2003. A museum within the former railway was opened in September 2017.

Operating as part of the Postal Museum, Mail Rail offers rides through the tunnels formerly used to transport mail between London sorting offices.