Advance Link System Plarail Advance Terminal

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Thats pretty cool and would allow for running more than one train on a loop but how does it work? Just guessing but it seems like the car that has the motor is triggered by something within the built-in track (on right) in the station but what could it be? Then what is triggering it to start to move a train approaches from the rear? If they were to make it for the regular scale Plarail I would assume there would have to be a separate sensing track placed further away to accommodate the longer trains to to tell the one sitting in the station to move. And whats up with the strange looking curves. Has plarail re-engineered these specifically for the Advance line to alleviate the slow down that they are plagued with? Thanks AC for the heads up.