The Lionel exploded diagram and parts list shows "drive tires" on the two geared wheels. You might need some new ones.
Jim
I have a similar problem with an old F I bought for my son at a train show. It will run around the track alone but has a hard time pulling more than two light cars. It literally spins its drive wheels, digging for traction. I pulled the shell off and it was full of old lead wheel weights, so the previous owner had the same problem. I'm a Flyer guy myself, so I don't know -- Are there traction tires for these units?
Jim E.
Bob Nelson
Have you tried adding a little bit of weight to the locomotive? Put some weight inside the engine area or shell, lead works well like fishing weights. Magnets may work too on the underside of the frame.
Lee F.
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