The car end sills complete the frame. They support the end rails, ladders, brake wheels, and the steps.
A large notch was cut into each sill so it would fit over the frame. When we were happy with the fit, we then started shaping
the ends. Each end was rounded by slowly sanding to the desired contour. A notch for the step riser was also cut into each
end. Epoxy primer was applied to help weatherproof the sills.