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To: maceng2 who wrote (37446)8/25/2003 4:26:55 AM
From: Raymond Duray  Read Replies (2) | Respond to of 74559
 
PB,

Re: You can build tunnels above ground as well as below. It is a matter of economics, technical, and safety considerations.

Many ways to skin the tunnel cat. On flat terrain, cut and cover is an excellent solution. In the mountains, TBMs are the cat's meow.