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The website http://broadway.pennsyrr.com/Rail/Prr/Maps/index.html has maps and interlocking diagrams for the entire NEC and Pennsylvania mainline from around the time period just before when the Pennsylvania Railroad switched to the Penn Central. You could also try www.blockstation.net for Amtrak Interlocking Diagrams from 1992 for the NEC. I am not sure if these go all the way to Boston, but they will give you very detailed maps and interlocking diagrams from Washington to NYC and west to Harrisburg and Pittsburgh. I hope that this helps and is what you are looking for. George.
Joe,http://docs.unh.edu/nhtopos/nhtopos.htmThis link is basically the same as the ‘maptech’. A quick check, and I do mean quick…, shows the quality of maps at both sites to be about the same. Neither being significantly better than the other.
The book The Pennsylvania Railroad by Edwin P. Alexander (probably out of print but available here and there) has a detailed schematic map of PRR electrified trackage from, I think, the 1940s.The March 1985 issue of Trains magazine had a schematic of the trackage from Washington to New York.And on Railserve (http://www.railserve.com/), under Sims, MSTS, Utilities (or categories to that effect), someone has posted a PowerPoint file with the MSTS NEC trackage, which I imagine differs from the real thing.The map in the PRR book is small scale (one page). I could photocopy it and the Trains map (spread over the bottom of several pages) for you if you like.Steve Dunham