Trains , Trains and more Trains

Answer: - Two long, one short, one long: Train is approaching a grade level crossing (i.e. a road crossing). This is a widely used safety signal used to warn motorists and is blown at every grade level crossing, except where local noise ordinances prohibit it. Known in railroad rulebooks as rule '14L'
SCGRR was the first with the right answer! Plus the link he found has been added to the Blog.
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