No video that I can find. I opened Sierra Sidewinder so I know how it operates first hand.
This image is from D'wervelwind @ Toverland but its the exact same station/transfer track design as Sidewinder.
The entire track assembly is moved vertical by a hydraulic lift. Once it's in the transfer position the train in the station approach (waiting block) can be advanced into the transfer or if there's a train already in the transfer it can be advanced from the transfer to the lift. The track can not be moved with a train on the station track. Hope this makes sense.......