I cut the opening in a #1055 shell for a coupler. That hole is smaller than the factory hole. Cut for O31 curves. That shell is on a #218 chassis. My #210 dummy got a roller truck and light from a #1055. One of my #1055 ALCO's is from my first train set. It remains stock. The two axle magnatraction lets the 200 series pull my steep grades. I will paint them green and gray with yellow trim.