Quote:
Originally Posted by k1052
I half wonder if it would be possible to build a single large bore quad track (2 subway, 2 NEC in a 2x2 stack) tunnel to accomplish both projects more cost effectively.
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From studies I've seen for other projects it isn't really the tunneling itself that costs a lot it's the stations. I don't think you would really save much having a single large bore tunnel instead of 4 small bore tunnels. Especially since they would have to diverge at the ends anyways which would mean you would still need the smaller TBMs.