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When a train enters the block containing the "Spur BitSwitch" the switch checks to see which direction the track switch points are set and then stops the train if the next block on the directed line is occupied.
This switch has special application and may also be used to provide Exit from an automatic section of your layout to an uncontrolled section. In any case the trains in the spur can be sent new commands for speed changes, lights, sound etc.. If a BitSwitch has stopped and engine the new command will not be activated until the train is released.
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