B&M Flying Coasters have two positions.
There is the "flying" or prone* position, obviously the mode in which the coaster was intended to operate:

And then the "loading" or upright position:

The red rails running across the length of the train in the station control the position of the train. There are wheels positioned on the train that run in the added station rails.
There are pistons that move those rails and adjust the position of the train that can be seen in this photo:

In the "down" position, the trains are in the operating position, and in the "up" position, the trains are in the loading position. Simple concept.