Obviously it's a little longer than an upright (possibly helps that I'm fairly short), so the threshold for how tight a corner is before I have to put it vertical is a little lower than it would be for an upright. But I was mostly thinking of cases where you'd have to do the same either way - my building's lift is too small to fit any kind of bike without putting it vertical on its rear wheel.

And yeah I take it on UK trains fairly often.