I had an op session on my layout yesterday evening, two normal-sized people, a large guy, and myself all fit into the same room with minimal issues (which proved I provided enough aisle space, for the most part).
The first photo shows three trains running at the same time for the first time ever. The foreground is obvious, but a passenger turn is to the far left and a freight switching is going on past the cornfield in the upper left background, directly above the coach.
Note the Jeep on the flatcar in the first, second and forth photos below, as well as the photographer in the grey suit standing to the right of the grade crossing, next to the ancient loading dock:
Normally, I run one train and let whoever is handing the center section of the layout do the switching for outbound cars, which keeps that person busy. But with a third guy, I pulled out a third ten-wheeler (ET&WNC # 9, the first time it's ran with the new road number) and ran a passenger train from the opposite end than normal. I think everyone had a good time.