Evanston, WY, was one of the icing points on the UP. The Bear River was (and still is) diverted into ponds where, in the winter, ice blocks were cut and stored in a large "ice warehouse". The blocks were packed tightly with sawdust, the insulator, and the ice lasted most, if not all, of the summer. The ice warehouse burned down long ago and I don't know exactly where it was located but it had to be close to the ice ponds. Although Evanston can get get rather warm in the summer daytime, the nights, even in the summer, routinely drop into the 40(s)°F so ice, correctly stored, can last a long time. Heck, I've seen a ¼" of frost on exposed surfaces in mid-July! No, we don't have much of a growing session here.
Laramie, WY, also had and icing plant. My mother-in-law's brother worked there icing refeers when he was young.
If you go on Google Earth and search for Evanston, WY, you'll see the ice ponds easily. They are the "square" water ponds just north of UP's tracks opposite the WalMart parking lot. Today, the ice ponts are fishing pond and, in the winter, the city clears part of one for skating. I don't know if the actual icing tracks are there anymore but might be part of the yard tracks on the north side of the UP mainlines.
Take care,