Hello, I am new here. I recently unearthed my old HO collection from 20 + years ago. Among my locomotives is a Bachmann 2-8-0 steam unit. Someone told me it may be an I-1. After all this time, the motor runs great, but the wheels seem to bind. I took it all apart to clean/lubricate, and I cannot see where the problem may be. All the linkage looks to be in plumb, but they do not roll smoothly. Any help would be greatly appreciated. Thanks!