I have the Lionel "O" gauge Moe & Joe operating lumber car. It operated once or twice on the UCS "O" gauge track but is finicky to get operating. I've checked the UCS track and it seems to be in good operational order. The contact rails are clean as are the cars contact shoes. I purchased the car new earlier this year. I checked to see if the mechanism that moves Moe & Joe is free to move and it is.
Is there something else I should look for ?