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[Neo]

Wired made an awesome video of what goes on after London's Underground shuts down each night. Crews have two hours to do maintenance on the system before it opens back up. It is amazing that they can maintain such a vast system in such a short amount of time. I can't imagine the amount of manpower required to do this.

[tSlater]

I had no idea they did that much each night, and within such a short time frame.  Wow.