On signal green - ok, this is pretty straight forward. Toot horn, flash lghts, set speed, etc. On signal red - so there will be an option other than stopping? Stop loco on signal - on a signal other than red? Or does this mean a signal from any device, not necessarily a signal. A signal (instruction) from another sensor perhaps? Resume loco on signal - on a signal other than green? And same as for :Stop loco on signal". I'm hoping the Stop and Resume on signal commands imply red and green. So unless instructed otherwise for given trains, at a given sensor you simply tell it to Stop loco on signal, Resume loco on signal and it simply does this for all trains.