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{{Other uses|Automatic Train Stop}}
'''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 induction]] to trigger a passing train to take some sort of action. The system was developed in the 1920's by the [[General Railway Signal]] corporation 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 1920's.
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