Thanks 

It's 600-034 - the small grey plastic bit is snapped in half and fell out.  Not sure if any of the other bits are missing..

  Thans for the link - have manged to do it, but the train not running - the coupling rod has come out of one of the ends - the plastic bit it fits into has broken so I need to get another.  Does that explain why the motor runs, the wheels spin but there is no traction? 

Hi yesterday you sent me a really good pictorial step by step guide - but i can't find it today.  Can you re-send please.  thanks

Having problems with this engine and cannot remove the body to look inside. Can anyone tell me how to remove the body please.  Am scared to force it off in case I break something. Are there any hidden screws that I need to undo?  Thank you