I remember those cards as well. We moved into a duplex in Louisville KY in 1940 (I was 3) and it had no refrigerator, only an icebox. As did all the other houses on the block. We moved to a newer neighborhood a few years later witha refrigerator - I missed the ice chips in those days before air conditioning.
In Louisville, the milkman converted to gasoline before the bread man did. IIRC, it was "Donaldson"s Bakery" and we kids would pull clover to feed the horse. The driver bitched considerable when he had to drive the truck instead of letting the horse make the stops :-).