I also made a video to test it. It starts from the red tracks (half of the station) and comes back to the station in a continuous circulation through the gray tracks. I calculated an average speed of 72Km/h (scaled) and takes 60 seconds for this built part of the circuit:
I don't have many advances, but I spent a lot of time learning, testing and thinking about blocks, detection sections, loops, servos.... to avoid missing any future requirement!!