Landsteiner posted:Try juggling 7 balls. You cannot do it. So I'd venture the guess that 7 objects under active control is more than any mortal is capable of dealing with successfully .
House rule at my place is, one train per person at a time. Anything else can get risky, because my track plan doesn't have multiple loops, but rather a very long single mainline, with sidings. I can't just set the trains on autopilot and let them run.