Marx motor problems

Scraped: with what? Can you show a picture of the motor?

FOREST

i scraped the copper with a flat head screw driver lightly, making sure no scratch Marks were left. Please note that I barely messed with the armature and never took it out. There is a photo of the motor.

Do you have an ohm meter to check the resistance between the three armature plates. They should all read the same. Next check for resistance from each plate to the armature shaft. Should be none. If that checks out it will ok to proceed. Use an Exacto knife blade to clean the grooves out between the armature plates. Use some 400 grit sand paper to polish the plates smooth.

Remove the brushes from the brush plate. If they are sticking that will cause the motor not to function. It looks like one brush is upside down. I use denatured alcohol on a Q-tip to clean out the brush holder slots. If the brushes are not too worn you can try to clean them with alcohol. Probably best just to replace them. 

It looks like that upper brush holder is broken.  I think you need a new brush plate.

I don't see that. The brush closest to the motor looks upside down with the slotted end facing up. The upper brush is in correct. Looks like they are stuck in from the gunk.

well I have been tinkering with the locomotives motor for a while, and was able to get it working! I will check on getting some new brushes just Incase I have to replace them in the future. Thank you for your help guys, I appreciate it. 

                              Thanks again! Trainfam