Shipping milk was a big business for RRs and interurbans before the highway were improved in the later 30s. What they used and the how they did it depends on the time frame of your layout. Plus a dairy could receive milk both ways. A cheese or butter plant wouldn't be as concerned with quality as a milk plant. Some Pgh. dairies had a satellite plant or two outside the city to collect the farmer's milk possibly separate the fat out and transship the milk to the city plant or to another processor like and ice cream plant. Lots of possibilites.
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