...tight as just under one foot in diameter. As far as I know most stuff that runs on rails will just laugh at you as soon as you think of having them run close to something like that. I tried to run a four axle, two bogie locomotive (my hideous old Piko) through such a curve in a test layout and it derailed, completely according to expectations. As there's clearly a minimum radius save major reconstructing of the chassis, I gave up trying to run that one. Undeterred by this setback, I decided to look for a simple, cheap two or three axle engine that could make this curve. Now as to my questions: Does any of you have recommendations for an engine to use for this. I'm looking for a simple tank engine or diesel locomotive. I'm not too picky, as I'll probably partially rebuild the body anyway. Are the small locos that come with starter sets the way to go?