40 or 42 for Athearn BB?

Model Railroader General Discussion (Model Railroader)
1

Which size North West Short Line replacement wheel sets best fit the standard Athearn blue box GP XX engine of the 1980’s and '90’s? 40 or 42?

Thanks! [^]

2

40" everything up to the GP/SD60.
SD70MAC have 42"

3

Up to the GP/SD60 ?? I’m not sure what that meant, tigerstripe. I use almost all SW’s, GP 9’s and some 38x and one GP 60. 40’s for all?

4

Yes 40", the GP60 and everything that was built earlier had 40" wheels.

5

Thanks, tigerstripe. That means I’ve been using the wrong size! [:(]

Back to the drawing board…I mean work bench.