On the Gemini, our signals were as follows:
Thumbs up: Supervisor in area, clear
Thumbs down or sideways: clear
Middle finger: Extra special guest on platform -- not mandated
Crossed arms: can mean anything from clear to cross to extra special guest on platform.
Crucifix arms: cross (good pun, eh?)
Holding wrist w/ one hand in the air: stop the train
Index finger pointing down on guest: Fat bastard, get the camera Amy or Rosie
Finger in mouth making puking gesture: Crackhead in charge
Finger in nose: Kipp in charge, be lazy and merry
Arms crucifixed when Jill is driving trains: I'm crossing but the trains can be sent anyways, my life is worthless (eh Kelly?)
Pumping fist: rain or set-up, thank god and clear the platform.
Crossing arms in air when Shane is driving and Renee is in the track releasing a lapbar: Die woman!
If any Gemini comrades can think of more I would be grateful. My list is not comprehensive nor is it official. I am talking specifically to the Gemini Princess on this one. Congrats on your TL offer Momma, I hope that we can see each other again soon.