For the first time I tried taking apart several N scale engines in order to try performing maintenance and lubrication. I was able to remove the couplers and shell, and the next step would be truck removal. I hoped this would allow access to more gears and the motor and associated parts. I have only taken apart Atlas engines, and you just had to pull down on the trucks to remove them. I have tried this on the GMD-1 no luck, but possibly I am not using enough force. I'm afraid to damage anything so before I really apply force, just wanted to check and see if anyone has run into the same situation.