Alan;

As I'm sure you know, full sized locomotives had tires (tyres?) that were turned on large lathes to reprofile them. I used to do a lot of full size stuff, but I'm forgetting the actual numbers, but a tire over here in Canada might have an extra inch of material available for removal before condemming.

So, 99.5mm might represent a locomotive that has had its tires turned, and as long as there's still something there (ie, you are not riding on the spokes) I'd be more than happy with that figure. And, it might look more prototypical than the 101mm.

How are you doing otherwise with the locomotive? I saw the preserved one early May for the first time, it was much more interesting than the 2 A4s beside it! (blasphemy, I know…)

Another JohnS

Perhaps if they only had one wood pattern they used some castings as patterns so accumulated some shrinkage.

Edited By Bazyle on 23/07/2013 16:22:26