Can someone explain the differences between the ends of 34’ hopper cars. I have 12 Athearn rtr coal cars with ends that are straight across the top. Athearn is offering a new series of numbers for these cars but the ends of the new cars are different. One end has a raised center with 2 equal slopes running to the sides of the car while the other end is raised but stops about 3/4 of the way across the car. What purpose do the raised ends serve, and why are the ends different on the same car?
Dave