My bachmann I just received is about 25 yrs old ,like new no ware marks.  I pulled out of box and the drive wheels came off.  The only thing the box states is OVERLAND 484-UP.  CAN THIS BE FIXED,CAN I BUY NEW DRIVES.  tHE ONLY OTHER MARKINGS ARE ON THE ENGINE,IT SAYS UNION PACIFIC.  THANK YOU..

I have a Bachmann 4-8-4 steam loco, the drive wheels are slipping out of the gears.  I am not familiar with locos, can you tell me how to fix this problem?