Since subways have been confirmed. I wouldn't recommend using them as ways of getting around underground since its a "breeding" ground for Z's. If they are low on food, eating the mice that are always there might be beneficial to them. We have to assume sewers are okay to travel and easier to booby-trap in case there are Z's coming your way. I only mention not subways because of this flick I saw, "Stag Night". It is possible to have a "rogue" group of Z's lying about somewhere in the city...
I do like the theory that if the Z's were smarter and more organized they would use the sewers and subway lines to get the jump on humans by using the behemoths to force them into an area where there are man holes to come out of. Just an Idea...
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