Wayne, here's a LINK to a method that I use for plugs between the loco and tender. I make the leads from the tender long enough so that, when the tender and loco are disconnected at the drawbar, the two can be separated so that it's easy to grasp the plugs to separate them. In service, the connected plugs and excess wire are stuffed into the front of the tender (I use a cut-off disk to make a suitable opening in the front wall of the tender), and the wires are barely noticeable. Good reliable connections, and a manageable size, and cheap, too!
:-D
Wayne

Wayne