Joined: Nov 2006
Posts: 19,811
Likes: 596
From: NJ, NYC, LI
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
Two important questions:
--How crowded is the train?
--Do you expect to ride the whole way sometimes, or do you expect to take the train every day?
If the train is very crowded, and you expect to take the train every day, then a Strida or similar (carryme, A-bike etc) is indicated.
If the train is fairly crowded, and you expect to ride the whole way with some regularity (such whenever the weather is really nice), then a Brompton or similar (Merc, perhaps Dahon Curve, etc) is indicated.
If the train is not crowded at all, and you expect to ride the whole way with some regularity, then a 20" folder --even an old Raleigh Twenty-- will do fine.
There are, of course other variables... such as, can you bring a bike into your office building? Can you stash a folded bike in your office? These things make a difference too.