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B&O/C&O 1969 Operating Rules - Rule 288 - Slow-Approach Rule 288.

color light signal red over yellow over red, or dwarf red over yellow no plate

NAME-SLOW-APPROACH
INDICATION-SLOW SPEED THROUGH CROSSOVERS, TURNOUTS, SIDINGS, INTERLOCKING LIMITS, AND OVER POWER SWITCHES; THEN PROCEED AT NOT EXCEEDING MEDIUM SPEED PREPARED TO STOP AT NEXT SIGNAL
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