For 76 years, a private underground line ran under the streets of London, completely separate from the Tube. And most Londoners have never seen or even heard of it because you could only ride it if you were a mailbag. I went to find out more about the story of the Post Office Railway...

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IMAGE CREDITS
Central London Railway by David Cane
https://commons.wikimedia.org/wiki/Fi...
West Derby Delivery Office by Rept0n1x
https://commons.wikimedia.org/wiki/Fi...
Mail Rail trains by Matt Brown
https://www.flickr.com/photos/5786831...
Mail Rail station by Steve Knight
https://flickr.com/photos/kitmasterbl...
Mail Rail train by Steve Knight
https://flickr.com/photos/kitmasterbl...