This is a bit of a hybrid, but since it is powered by tinplate, I'll post it here.
This is a Marx Riser Gear windup motor, but as you might have noticed, there is a bit of extra mechanism at the front. The motor is basically stock with the exception of a lot of extra gearing to make the governor spin faster.... and since the governor can only spin so fast, it means the motor runs considerably slower than stock. A lot slower. Since the gearing between the mainspring and drive axle is stock, the pulling power and running distance is comparable to a stock Marx Riser Gear motor. A stock motor like this will complete 5 laps of my mainline in a bit less than a minute. This motor takes nearly 8 minutes to cover the same distance.
Why is it a hybrid? Because I installed it in a Lionel #8796 diesel switch engine shell... a plastic shell...
It sure is fun to see it putter around the layout: