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I was flippin'-through one of my favorite railroad books the other day on the Chicago Great Western.  It had some photos of the big Oelwein Yard and some of the pictures showed the loudspeakers mounted on posts between the yard tracks that the yardmaster used to communicate with the switch crews. Did other railroads use this approach to yard communications?  I don't recall seeing loudspeakers in yard photos taken before the use of radios.  I'd have to believe this wasn't terribly efficient what with the noise in a diesel cab or worse in the case of a steam engine.  I imagine there must've been some way for the switch crew to acknowledge their receipt & understanding of the message (whistle?  flag?) or the yardmaster would repeat the instructions?
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