I think the videos that you saw was them doing a "recovery" launch. If the train stops on launch 1, they will launch the train backwards (towards the station) and then it will slowly roll forward to get a "running start" for launch 1. When the train is dispatched from the station- it will enter launch 1 much faster.
This shot from @matthewcsoup shows a dispatch from station.
And this shot is a "recovery launch" (or at least that's how I define it)
Correct. Copperhead Strike does the same thing on its second launch.