Universal Orlando Resort (USO, IOA) Discussion Thread in Theme Parks, Roller Coasters, & Donkeys! Posted August 6, 2017 It looks like they added trim brakes on the first drop of HRRR, I wonder when and why. They have been there at least a year, maybe two. And they aren't trims. Correct, they're part of the emergency stop system if a train needs to be evacuated on the lift hill.