I don't think there is so many rollercoasters left in the world that uses an onboard brake operator, but i think it would be a fun quirky thing to add into the game. I can imagine some really fun animations if the idea is taken on.
Here is a video i found if you don't know what i mean. https://youtu.be/nFhoVLDkFbU?t=24s
Here is a video i found if you don't know what i mean. https://youtu.be/nFhoVLDkFbU?t=24s