Quote:
Originally Posted by Wormius
If the city will have the tunnel boring machine, wouldn't it make sense to complete the whole route underground, and add in the northern stations as the budget permits? It just seems like a waste, from a laymen's perspective, not to. It seems better than adding surface tracks, safety barriers, stations, etc later.
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Operating a TBM is most of the cost. You don't want to bore more than you have to.