If you want I know how to make the Trackmaster 2 engines freewheel basiclly unscrew the 3 screws in the bottom then take the battery holder off and you'll see a big metal thing (The Motor) take that out and put the battery holder back, screw the 3 screws back and be sure to take out the batterys and you got a freewheeling trackmaster 2 engine NOTE: Please note that you will not be able to put batterys in unless you put the motor back