Build it Bigger on the science / discovery channel had an episode about how they build the subways in NY. It was a cool episode. http://science.discovery.com/v

Build it Bigger on the science / discovery channel had an episode about how they build the subways in NY. It was a cool episode. http://science.discovery.com/videos/build-it-bigger-season5-nyc-subway/ http://science.discovery.com/videos/build-it-bigger-season5-...