I've got some Riverossi and Pola-Maxi O scale trains that I picked up in Germany back in the 70's, also some Marklin HO. I'd like to have a MTH Krokodil or the 2-10-0, but the budget is taken up by layout construction right now. Maybe someday.
BTW, the scale size difference is minimized by the smaller loading gauges of Europe and the UK.