That was my thinking. Would be a bad buy if the train turned out to be too busy for the bike and the bike caused a lot of ill-feeling.
I'm edging towards a Brompton LX (mod'd to 6 gears), Mezzo D9 or Birdy (Red or City, not sure) or Dahon Jetstream P8 or XP - very nice looking in photos.
Matt52 - option of the Capreo 9-26 - is that something that can be added? Do you ever find yourself wishing for another higher gear?