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{{Short description|Rail signaling equipment}}
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{{More footnotes|date=September 2014}}
{{One source|date=May 2024}}
{{Original research|date=May 2024}}
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{{Other uses|Automatic Train Stop}}
The '''intermittent inductive automatic train stop''' (also referred to as '''IIATS''' or just '''automatic train stop''' or '''ATS''') is a [[train protection system]] used in North American mainline railroad and rapid transit systems. It makes use of [[magnetic reluctance]] to trigger a passing train to take some sort of action. The system was developed in the 1920s by the [[General Railway Signal]] Company as an improvement on existing mechanical [[train stop]] systems and saw limited adoption before being overtaken by more advanced [[cab signaling]] and [[automatic train control]] systems. The system remains in use after having been introduced in the 1920s.
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