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Originally Posted by niel
That's not entirely true. Obviously we have no Roman ruins, but there is a lot of archaeologically significant stuff buried under Philly's streets, and any major subway project would have to take into account a fairly lengthy process of investigation as to what exactly was being disturbed.
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probably not like 2000 years worth though. a simpler way to extend the "underground" would be to convert the R6 and R8 lines into metro type service and put them into the BSL tunnel. one could head to 8th and market. the rails are there. this could probably be the most cost effective way to extend the system.