Gaps in Northeast Corridor commuter rail.

[randomness]

MBTA Providence/Stoughton Line terminus (http://www.mbta.com)
Providence Amtrak Station
100 Gaspee St
Providence, RI 02903

Gap: 57.4 mi (about 58 mins)

Shore Line East terminus (http://www.shorelineeast.com)
New London Amtrak Station
27 Water St
New London, CT 06320

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SEPTA-R2 terminus (http://www.septa.org)
Newark Station
10 Mopar Drive
Newark, DE 19713

Gap: 22.2 mi (about 29 mins)

MARC Penn Line terminus (http://www.mtamaryland.com)
Perryville Station
650 Broad St
Perryville, MD 21903

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(Distances from maps.google.com.)
(Again, mostly for my own reference.)