The Jubilee, Northern and Picadilly lines of the Tube are undergoing a major rebuild, overseen by the London Underground and a maintenance supervision company called Tube Lines. So as they begin laying new track and adding sparkly new cars, what happens to the old ones? Most become scrap metal and end up in pieces in landfills. But a group called Village Underground wants to tranform these discarded Tube carriages into workspaces for small businesses. Tubelines decided that this proposal made some sense -- reduces waste, supports community members, and extends the life of perfectly functional containers. Sounds about right for a Worldchanging-size staff, but for bigger crews, the cars might need to be linked back together. Pretty soon you'd have a train again.

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