The longest wait I've ever had on TG was 10 minutes. I know that it stops automaticly, because there are 3 types of blocks. Station, Block Brakes, Chain lift. If the next block after the Chain is not cleared, then it stops and waits untill it's cleared. TG has air brakes to stop it, and it goes like, 45 miles an hour going into the brakes. I swear, every time I ride it I can easily imagine the brakes malfunctioning, and crashing through the station. I hope that never happens.