Reply to "AF 336 Northern Help"

Thanks for all the great info!  Yes, the 336 came with very thin traction bands on non grooved wheels; believe the later 5 digit AF steamers had grooved rims.  Removed the traction tires, polished the wheels and runs much better; no derailments and no noticeable wobble; 20" radius track is still to tight.  Ordered very thin "traction bands" from Portline; also checked the rims and wheels for looseness; none found.  And yes, the present day traction tires (no matter how thin) is a serious no no.  Again, thanks to all; take care; Falcon70