camera iphone 8 plus apk Craig Schelter on Engineering Challenges Behind the Commuter Tunnel

Philadelphia: The Great Experiment (Breakthrough)

Former PIDC Vice President Craig Schelter outlines a few of the engineering problems associated with digging under nearly 20 city blocks in downtown Philadelphia to attach two underground rail stubs in the 80s.

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camera iphone 8 plus apk Craig Schelter on Engineering Challenges Behind the Commuter Tunnel
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Education	Upload TimePublished on 12 Mar 2014

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