Most trains have designated women only cars as a way to provide some protection from "chikan" -- gropers -- a group of deviants apparently reaching near epidemic proportions over here. Unfortunately, if you don't want to risk being groped (at least by a man) you must ride the train in the early morning hours...seems to go against logic since it is at night (after a few beers and sake) that men are most likely to transform from respectable "salary men" into groping and slobbering morons....