WDW History nut
Wasn’t there some issue at Everest where they used to use fog to hide the track switch but had to turn it off because it kept triggering sensors?
Indeed. Being water based it was starting to corrode sensors.Yes. My understanding was it was related to the fact they were using a water mist. If you had ridden the attraction with the fog you would know the huge difference fog can make! Not seeing the track switch and falling through the fog and out of the mountain was an incredible effect.