Try PROTO 1000 or 2000 wheelsets by life like. You'll have to ut the spikes on the outside of each wheel set and grind it down so that it is flush with the wheel. The axles is smaller. I've used Northwest Shortline wheelsets for my Walthers Amfleets also but I think the former may be the way to go.
Also add conducta lube to the wheel bearings.
Hope this helps!
Kyle
Also add conducta lube to the wheel bearings.
Hope this helps!
Kyle