The loco is from 6-48080 it's the C&O GP 7 the defender set.
i am pretty sure the motors and worm gear plus the mounts are the same from all the models. For a better view go to lionelsupport.com in text search just type in 6-48 only. That will show you products beginning with the catalog number starting with 6-48.
view the parts for the loco motive. If you need help or call lionel or just buy the parts shown