I have an "o" gauge diesel # 2032 and a steam engine #646. Both of them run well but I cannot get good traction with them. They are hard pressed to pull more that 7 or eight cars without significant wheel slippage. And this is on th flat. I have cleaned the wheels and removed a lot of residue and the track is virtually brand new. Any suggestions? Anyone know what these engines should be able to pull? Also, there seems to be alot of "wobble" in the drive wheels of the diesel. What should I be looking for? Any info will be greatly appreciated.