Kevin,
According to the Consolidated Code of Operating rules, which many roads used
but I'm not sure if the Q did, the white warning light was used as a general
warning light for crossings at grade and for anyone on or close to the right
of way. If the train experienced an emergency application of the train
brakes then the red was turned on indicating to opposing trains or trains being
met the train was in emergency and other rules apply for this condition. The
white could also be set stationary and use as a headlight in the event of
failure to the regular headlight.
rich
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