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Re:Hyperloop Update: Elon Musk Will Start Developing It Himself by cpeterso on Tuesday August 13, 2013 @12:20AM (#6203975)
The London Post Office ran an underground mail rail with small trains from 1927 to 2003:

https://en.wikipedia.org/wiki/London_Post_Office_Railway

Here are cool mail rail photos from some urban spelunkers:

http://www.placehacking.co.uk/2011/04/24/security-breach-lon...

Re:Hyperloop Update: Elon Musk Will Start Developing It Himself by tehwalrus on Tuesday August 13, 2013 @07:45AM (#6205135)
I very much enjoyed reading that placehacking article, thank you! :)