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Addressing recommended replacement of certain components in Harmon Industries' "Electro Code 4"' and "Electro Code 4 Plus" intermediate signal units
Keywords: Signal and Train Control; symmetry distortion ; signal lighting ;
Safety concerns involving Model B1 relays, manufactured by General Railway Signal (GRS), between the years 1960 and 1985, and their potential to stick and remain in the energized position. ALSTOM Signaling,Inc., which has acquired GRS, estimates that app
Keywords: Signal and Train Control; GRS ;� relay failure; B1 relay