Due to the wave of mergers that have occurred since the 1960s it is not uncommon to see a single railroad operating many different types of signaling inherited from predecessor railroads. Individual railroad corporations are free to devise their own signaling systems as long as they uphold some basic regulated safety requirements. There is no national standard or system for railroad signaling in North America. Signals may be of the searchlight, color light, position light, or color position light types, each displaying a variety of aspects which inform the locomotive operator of track conditions so that they may keep their train under control and able to stop short of any obstruction or dangerous condition. North American railroad signals generally fall into the category of multi-headed electrically lit units displaying speed-based or weak route signaling. Main article: North American railway signaling Baltimore and Ohio Railroad color position lights on bracket masts at Magnolia, West Virginia
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