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High Quality Content by WIKIPEDIA articles! North American railroad signals generally fall into the category of multi-headed electrically lit units displaying Speed based or weak route signaling. Signals may be of the searchlight, colour light, position light or colour position light type each displaying a variety of aspects which inform the locomotive engineer of track conditions so that he/she may keep their train under control and able to stop short of any obstruction or dangerous condition.

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High Quality Content by WIKIPEDIA articles! North American railroad signals generally fall into the category of multi-headed electrically lit units displaying Speed based or weak route signaling. Signals may be of the searchlight, colour light, position light or colour position light type each displaying a variety of aspects which inform the locomotive engineer of track conditions so that he/she may keep their train under control and able to stop short of any obstruction or dangerous condition.