I have a rivarossi 2-8-8-2 and i don't know how old it is. I purchased it for $25 and it runs and doesn't run. I checked the motor which runs fine when disconnected form the drive. I am thinking the drives are binding. They look like PTO's hooked to each set of 8 drivewheels. I can give them a twist and it will go about two inches and bind up again. Is there any way to get them to turn without binding.