Everybody knows this is a built in feature for battery power. But up until now is has always required an operator for each train, or a very alert and sober single operator.
RailBoss 4 Software has been upgraded with “Multi-Train”. You can now run two or more trains on the same loop, with automatic train separation, fully unattended.
Check it out at GScaleGraphics.net (I can’t ever remember how to do links here)