Is it possible to tilt it just a little to roll it on only one wheel? I have done that on several bikes. If you do it right and do it often it could feel quite "normal". Maybe a strap (welcro) is needed to keep it from unfolding when you do this. We are lucky that both folding and full size bikes can be rolled (and thereby also used as a luggage trolly) in the trainstations as long as you pay atention and keep away from crowds. I am sure this is more difficult in the rush hours on commuter trains.