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In page Long Island Rail Road:
"Today's LIRR signal system has evolved from its legacy Pennsylvania Railroad (PRR)-based system, and the railroad utilizes a variety of wayside railroad signals including position light, color light and dwarf signals.[1] In addition, much of the LIRR is equipped with a bi-directional Pulse code cab signaling called automatic speed control (ASC), though portions of the railway still retain single direction, wayside-only signaling. Unlike other railroads, which began using color-light signals in the 20th century, the LIRR did not begin using signals with color lights on its above ground sections until 2006.[citation needed]
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