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The Post Office Railway, also known 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 move mail between sorting offices. Inspired by the Chicago Tunnel Company, it operated from 1927 until 2003.
== Geography ==
The line ran from Paddington Head District Sorting Office in the west to the Eastern Head District Sorting Office at Whitechapel in the east, a distance of 6.5 miles (10.5 km). It had eight stations, the largest of which was underneath Mount...