No way there are 8 trains outside at the same time. Not enough track, and only one stopping point. if there are more than 4 outside at a time I'll be surprised.
The station isn't the issue. It's the drop track. The block prior to that is the spike. So the train has to leave the spike, roll all the way back into the building, drop, shoot out, then reset the drop. All before the next train can hit the spike. There will also be some sort of show scene there too with the Devil's Snare. There might be somewhere in there they can shave a few seconds if theres a set of brakes by the spike, but no way that block is only 20 seconds.