hello BradFish1.........
I think the latest WBB NPR berk is # 765 and WBB has the on-line catalog check it out at bachmanntrains.com and click on "Williams". There are on-line dealers that have them for much less than the bachmann pricing. I had a santa fe version berk and it is a GOOD runner but had wobbling drivers but not from the traction tires. I hope this helps.
the woman who loves toy trains
Tiffany