It is a pretty nice locomotive. Pros: Nice Headlight, Good Detail, Easy to access under the shell and trucks. Cons: ATSF 3500 is not a GP40 it is a GP38 Santa Fe only operated one GP40 and this is not it. This probably the biggest con and I have had some issues with the the locomotive not coupling to my rail cars. Other than that it is a good locomotive. If you are a prototype modeler be warned but if you are a freelance modeler this should be great for you.