Post Office Railway

A 10-km (6.5 mile) underground track between Paddington Station and Whitechapel sorting offices, it was served by a fleet of 2-ft gauge driverless electric trains, once transporting 30,000 mailbags containing four million letters and packets every day.

• Operated 19 hours a day, 286 days a year
• 23 Miles (37 Kilometres) of 2 foot gauge track
• 70 feet (21 meters) below the streets of London
• Fully automated, computer controlled trains
• Carried the Capitals mails for over 75 years
• Once served 9 stations, including 2 mainline stations
• Once carried around 4 million letters every day
• Paddington to Whitechapel, with all stops, in 26 minutes

The Mail Rail is currently not open to the public, but plans are afoot to open it in 2015.