hahah wtf?? if your boot gets caught on a train chances are your already loosing a limb...
just keep the laces tucked inside or under a pants leg and youl be fine.
and steeltoed boots are alright, you get a LOT of toe room in most cases which is cool, but in the colder months the steel gets real cold and stays real cold, so your toes will almost always be freezing.
edit: and boots are actually probably the best idea on trains as far as footwear goes. you can walk for hours on ballast and not feel it, (any more then you would from walking for hours on flat ground) youve got ankle support, and if you were smart when you got em youd have a profound heel so when your catching on the fly and your foot slips, your leg wont go through the ladder.