Rivarossi 4-6-4 Hudson tender problem

ive gone my rounds with a stubborn blue goose. it turned out to be corrosion on the screws that mounted the tender trucks to the frame were corroded and the section of wire that goes from the motor to the frame was shady. make sure to keep the contacts to the tender wheels clean and keep the wire on the draw bar clean or you will end up with a locomotive that runs like Chicago rush hour traffic. stop, floor it, slam on the brakes, floor it and so on. the newer Hornby model rivarossi locomotives with can motors are excellent but the older ones can be a pain