Hello everybody and hope you all are well and safe. A little while ago, I bought 2 Atlas EMD SD-7s, both in the Bessemer and Lake Erie road name, different road numbers, as this railroad actually ran through the hillside behind my house here in Mercer. Both are really in nice shape and excellent runners. Problem is, I cannot keep anything couples to them. I have freight cars from Atlas, Micro-Trains, Intermountain and Athearn and none of them will stay coupled to either engine, in fact engines will not stay coupled to each other. My first question is there a better coupler out there that I can change to that will help. Couplers on both engines look like simple one piece knuckle couplers but I may have the name of this type wrong. I know they do not look like the ones on any of my cars and they are not the rapido type couplers. If it helps, the Atlas #'s are 4508 and 4509. Second question,I would like engines to run 1 cab forward and the other with the cab at the opposite end, how is this done? I am okay with them both running with the cab facing forward but I think I really would like them better with cabs on opposite ends. Anyhow, like always, I really appreciate your help and ideas as they have really helped me get my layout going, thanks again.