Hi Tim, my experience is that with short rolling stock you should not face any problem with 371 mm. Issue can arise with locos, instead: again, short machines with few axles, should run without problems... Andrea

I agree with Andrea. Hornby/Peco R1 curves will do the job unless you will not use any 0-10-0 or 2-10-0 loco's with tenders. Even doubtful with 2-10-0 tank loco's like the Br85 and likes. Erkut Baykal

Tim, I think that you could get down as far as 360mm, but I would tranistion into it. I had to put in a 850mm diameter curve and went 515, 437, 360, 360, 437, 515 diameter curves. I pull trains that are two meters long around it with no problems. John