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@FrankIBC:
With respect to the tunnel, see my comments above.

The NextGen HSR will be running at a top speed of 220 mph, and needs the track to be fairly straight. In most cities, that means either (a) massive takings or (b) going underground.

North Philadelphia won't be a problem. The NextGen HSR will be going on an underground alignment through Philadelphia, including a stop at PHL Airport and a new underground HSR terminal at Market East Station (not Philadelphia-30th Street).

To put it simply. A tunnel is largely necessary because the line needs to be straight and there are a few neighborhoods in the way.

by Matt Johnson on Jul 26, 2012 10:51 am • link • report

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