As a "Ham Radio" operator for 45 years we have used dash dash dot dash for the letter "Q" when using CW Morse Code.
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I think they call it a "whistle post" to alert an engineer that a crossing is coming up and to use 2 longs, a short and a long blast from the whistle for a warning. I really don't think it has anything to do with Morse code.
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I think people fail to see the humor in the photographers statement. I get it...
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