So unrelated to evac but an interesting note:
I remember way back near the first year or two of Griffon being open that some dude I'm front of me had his hat tossed by one of his buddies over the fence and in the grass by the brake run.
Idiot proceeded to climb the fence (mind you, this is in the switchback right before getting into the station, so this was next to the transfer track), and go grab his hat. If my memory serves correctly, not only did he do all of that and get back in line (ops were running slow), but the ops team didn't stop advancing trains and there wasn't any noticeable downtime.
I rode with some of my friends a few moments later, and kind of forgot to see what happened to the guy - not sure if anyone said anything to him.