As Joe points out, it can be done but is a hastle. Bear in mond that you can speed up the conventional without affecting the DCS loco speed, and you can slow the DCS without affecting the conventional's speed. So always have the conventional train heavier, so it wants to run slower.
Before DCS, I would run conventionals on the same "loop,", which is why I have 70+ blocks: I couldm stop a loco gaining on another train.
