Does anyone know any 'loops' into NJ?
NJT Montclair-Boonton Line (runs weekdays peak direction only beyond Montclair) to Denville, Dover or Hackettstown, the Morristown Line back to Newark.
I suppose any trip north of Glen Rock one way on the Main Line, the other way back on the Bergen County Line
In Philly: PATCO to the RiverLINE to Trenton to SEPTA Regional Rail back into Philly
-Chestnut Hill West Line, walk to the Chestnut Hill East Line
-MFL to the Norristown High-Speed Line to the Regional Rail Norristown Line.
With Relatively Short bus rides (here are a few neat ones):
-Metro-North Harlem Line to Brewster (or an out and back to Wassaic) to HART (Housatonic Area Transit) Route 3 to Danbury for the New Haven Line back into New York.
-NJT Pascack Valley Line to Spring Valley to the Tappen Zee Express to Tarrytown (or White Plains) and Metro-North back.
How about this Amtrak loop day trip:
Metro-North or Northeast Regional to New Haven to a Shuttle to Springfield. (I guess or the first morning Acela to Boston)
Lake Shore Limited through the Berkshires Springfield to Albany
Adirondack or Maple Leaf (Ethan Allen Express or Empire Service only on Sundays) back down the Hudson to NYC.
Similar loop from Boston: Lake Shore to Springfield, Vermonter to New Haven, Northeast Regional back to Boston.
You could also conceivably ride the Ethan Allen Express to Rutland, spend the night take
CURRENT Route 57 (weekday rush hours only, $3 for a two hour ride) to Bellows Falls and take the Vermonter back.