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Top Terms > Communication and control > Control > Control system applications > Traffic control > Railroad traffic control > Railroad signaling > Block signal systems > Automatic block signal systems

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Automatic block signal systems (Dcmtrsbb)

Definition
Systems in which signals are actuated automatically by a train, a broken rail, an open switch, a car standing on a turnout that is fouling the main track, or some other shunting of the signal circuit. (Source: AASHTO Glossary)
Broader Term
Block signal systems (Dcmtrsb)