I went to SFO twice and I left calling it the one train park. They were running two trains on BKF, but only one on villain part of the day (they did add a second). S:UE, Big Dipper, Boomerang, Double Loop, RWB, Serial Thriller, and Roadrunner Express (I think the train is longer than the track) all only had one train going. Some were obvious due to design, but otherwise the throughput was terrible. I don't understand how the can only run one train on the Vekoma SLC's. I waited forever and the line was really small.