Aussteve
I am in the 'older' person range with a large collection of F3's. This is my first SD-40 engine which was given to me. One motor didn't work because the worm gear on the armature was badly worm and slipping. Now, the Lionel box list the engine as " CP Rail SD-40 Diesel....". Because Lionel listed the engine as SD-40, I used the same term.