I recently picked up one of the hawthorne NFL edition train sets like this. I found that the "engine" part, although it has the cast frame to be powered, it is not. I found on youtube that you can purchase the locomotive and just swap the shell over and have a powered engine to match the locomotive. I am looking for a cheap locomotive to scavenge the running chassis out of. HO scale, and looks very similar to the santa fe type locomotives. This one has 2 screws in the fuel tank belly pan. I am just starting out, so i dont know much about this hobby, but i will answer any questions you have. Thanks!