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Back prior to radios, the lead locomotives use to communicate with a helper through steam whistle signals. Does anyone know where to find what these signals were? Mostly for D&RGW or RGS.
 

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Does anybody know when these (and other RR rules, for that matter) were codified nationally?
 

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All of the whistles are different for each railroad. Here are the basic ones for the railroad I work for:

"o"=short "--"=long

-- = Standing, brakes applied
-- -- = Release brakes, proceed forward
o o o = Release brakes, proceed back
-- -- o -- = Approaching crossing

These are common on many railroads, especially the crossing one
 
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