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Pulse code cab signaling
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<p>Pulse code cab signaling is a form of <a href="/facts/Cab_signaling/KHhlJLe3">cab signaling</a> technology developed in the United States by the <a href="/facts/Union_Switch_and_Signal/2UHLsEx5">Union Switch and Signal</a> corporation for the <a href="/facts/Pennsylvania_Railroad/ajhjU4KH">Pennsylvania Railroad</a> in the 1920s. The 4-aspect system widely adopted by the PRR and its successor railroads has become the dominant railroad cab signaling system in North America with versions of the technology also being adopted in Europe and rapid transit systems. In its home territory on former PRR successor <a href="/facts/Conrail/N2CMgdsr">Conrail</a> owned lines and on railroads operating under the <a href="/facts/NORAC/4Lb3MsAd">NORAC</a> Rulebook it is known simply as Cab Signaling System or CSS. </p>