Roundhouse, now is Athearn's previous DC/DCC ready line, which came into being after a couple of upgrades from Blue Box. Much better shells, more accurate dimensions/detailing (wire grabs factory fitted, directional lighting with a mother board that would accept 8 pin an 9 pin silent DCC decoders. "Quick Plug" they were called on the boxes, also now with windows) and better chassis with extra weight. No gaps in the front and rear pilots. Couplers on the smaller diesels usually secure the shell in place, 6 axle ones may have a couple of screws extra. Pretty easy to work on.
