I've even put our tandem in the baggage room in Amtrak trains, with no box. Maybe the first time the person in charge didn't know the procedure and they just let me wheel it in, set the drag brake as a parking brake, and bungee-cord the stoker bars to the vertical stainless-steel tube holding up the shelves, then after that, every time they gave me even the slightest trouble, I'd just tell them I've done it many times before and it works out really well, and they'd basically say something to the effect of "then go right ahead if you know what to do." It was easy for all involved and they didn't mind a bit. I've done this many times. It has been my understanding that for many years they've been barely able to keep going even with federal subsidy, and they don't like to turn away customers.