When I was just a kid during WWII, we had a horse-drawn milk wagon stop at our house each morning. The horse knew when to stop at each of his regular delivery points - the milkman just whistled, and the horse went on and stopped at each of the houses.
In the summer, being a milkman had fringe benefits. In those days, people kept cool at night by sleeping on "sleeping porches" in Phoenix, usually nude or scantily attired, and covered by wet sheets to take advantage of the evaporation cooling principle. Those early-morning milkman visits sometimes gave 'em some interesting views if the sheets had fallen off overnight!
Many homes had "ice boxes" which were loaded regularly by icemen, also with horse-drawn wagons. They wore leather shoulder protectors, and drew an ice block from the wagon with tongs, threw the block up over their shoulder, and placed the ice in the box. The ice was placed higher than the contents so that the cold air could circulate down, and it had a drip tray underneath the ice. Some homes had those modern "fridges" that cooled by electricity, though. I remember going up to the iceman at his wagon, and he'd chip off a piece of ice for me as a treat on those hot summer days in Arizona.
We have it pretty easy today compared to the "good ol' days!"
John