A Modern Cab Signaling and Train Control System for Railroads

Abstract

Increased safety of train operation is effected by the continuously controlled cab signal which may be augmented by means for applying the brakes automatically in case cab signal changes calling for a reduction in speed are ignored or pre-determined speed limits are exceeded. The engine-carried apparatus is inductively linked and selectively responsive to coded alternating current in the running rails, the frequency of coding determining the cab signal indication displayed and being dependent upon traffic conditions ahead. Absence of rail current or the presence of uncoded current establishes the most restrictive speed conditions.