Adam models HO and asks:

“The front gearbox on my Proto 2000 GP9 diesel has seized up. The rear drivers still turn as do the flywheels and front drive shaft. The front driver gears won’t. I will need to take out the motor and gear boxes, but I’m not sure how to go about that and fixing the problem. Some words from the wise would be very much appreciated. With thanks.”

Please add any suggestions to assist Adam under this post.