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Basically, a spring loaded switch has the points held in place by the tension of the springs, so in most cases the train traveling east, lets say, always goes straight, or in the case of the movie, into the "hole". Then the trains coming west will hit the switch and the wheels will automatically set the points to the other rail without having to throw the switch, as the springs have enough give to allow the points to travel acoss. After train passes, the switch automatically closes to the other side.The O &W and later the NH used  these switches.
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