On analog, I dont MU engines because both will need a certain voltage imput to remain alive. DCC is better for this work.
If you issue a horn command, both will blow unless one of the engines are configured as a helper with the horn disabled.
Regular analog engines are mu'd until the throttle cannot feed em all lots of times in the past. But they cannot run with DCC engines due to voltage problem mentioned before. Starting a DCC at about 8 volts already has the analog one going half speed.
I pray every day I break even, Cause I can really use the money!
I started with nothing and still have most of it left!