That's an old three-pole Rivarossi motor, mounted in the world's fastest switching locomotive. The brushes are in brass tubes that just pull straight out of the motor. That loco had a minimum speed of about 60 scale miles per hour and at full throttle could easily break 150. It's usefulness as a switch engine, or even as a road locomotive, was pretty bad, to say the least. There are much much better switchers available now, including some that are quite close in size & looks to that one. I'll let you decide whether you want to replace the brushes, the motor, (if you can find either for this 1970s model) or the whole locomotive with a much better-running one.