DCC for motor control is very simple to wire. Not as simple as direct DC however as mentioned above. But it is just 2 wires from the rails to the decoder, and 2 wires from the decoder to the motor. Everything else you do with it is an accessory add-on. You could wire the decoders in parallel if you had one for each motor as you suggest. Each would respond only to its unique address. You would have to program them one at a time however, at least the first time. After that you could program directly to each address and the others would ignore it. this is called "programming on the main" in many places. With digitrax, it works just fine, and there is no way to access more than one address. So you can't program more than one decoder that way, unless they have the very same address. I have done this many times to adjust momentum or other things on a specific loco.
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