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B&O/C&O 1969 Operating Rules - Rule 284 - Approach Slow Rule 284.

color light signal yellow over yellow

NAME-APPROACH SLOW
INDICATION-PROCEED APPROACHING NEXT SIGNAL AT NOT EXCEEDING SLOW SPEED; TRAIN OR ENGINE EXCEEDING MEDIUM SPEED MUST TAKE ACTION AT OR BEFORE REACHING APPROACH SLOW INDICATION TO REDUCE TO THAT SPEED
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