I have some derelict MTH bumper trolley cars that I am going to repurpose as double truck, 11-window, double pole cars of the Long Island Traction Company, and for the Huntington Railroad. The trucks and motor will be salvaged from wrecked MTH Brills.
The MTH bumper car has 8 windows, so I will section a car body to get a 3-window segment to splice-in. I am thinking of modifying the roof of the car into a railroad type by rounding down both ends of the existing clerestory roof.