Jeff Smith wrote: ↑Thu Sep 28, 2023 6:52 am Like a tree, you have a trunk and branches. I look at at the DC - Boston portion as the "Grand Trunk" of the NEC, heretofore known as the "Main Line".I consider LD to be "overnight" while the Vermonter, Pennsylvanian, et al that start and stop on the same day to be "daytrip" routes. The Keystone is more of a commuter route.
Definite Branches:
-Philly to Harrisburg: factors include electrification and through trains (Keystones).
-New Haven to Springfield: while not electrified and requiring a change of engines, the route still has two Regional through trains. I don't consider the Vermonter as it's really an LD. I suppose you could consider the Valley Flyer as part of this, but I'm really on the fence with that one.
-Virginia: VA to Richmond has become an extension of the NEC with many Regionals continuing past DC. Other destinations such as Newport News, Norfolk, etc. are branches of that extension. Again, I don't consider electrification to be an overriding factor (electrification clinches it, but is not necessary here IMO.
Not:
-Empire Service. Not electrified, and just rings to me as separate as it really doesn't "touch" the NEC, even in Moynihan/Penn where the operate off distinct tracks.
Amtrak's Northeast page somewhat supports these conclusions: https://www.amtrak.com/northeast-regional-train
But in terms of the NEC, yes to the main line, yes to most of the branches, no to south of DC being a branch, and yes to Empire not being a branch.