An output from the interlockingSee IXL systemSet of interacting entities, conceptually aggregable in a ra... toOperator Terminal a TCCSTrain Control Command System or other supervisory systemSet of interacting entities, conceptually aggregable in a ra... toOperator Terminal inform the signaler asAccess Server toOperator Terminal the condition of the railwayNetwoprk. Common and varied use term, indicates railway syst...
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