You need a new set of drive wheels that have the axel in the center. The only time I have had this was with a loco that had plastic inserts in the driving wheels and was stored with allot of weight on it and the inserts went out of round kind of like a car that is parked for a long time ends up with flat spots on the tires. Good luck in any event and buyer beware. Jersey Bill
![Felix "Unfair" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/Oswujxm2Ag0/mqdefault.jpg)
You need a new set of drive wheels that have the axel in the center. The only time I have had this was with a loco that had plastic inserts in the driving wheels and was stored with allot of weight on it and the inserts went out of round kind of like a car that is parked for a long time ends up with flat spots on the tires. Good luck in any event and buyer beware. Jersey Bill
Because you said you didn't know what it was, I'm letting you know it's an Aristocraft model.