My maternal grandfather worked in the roundhouse in north central SD for years.  My Mom was just a child when he started there, and she and my grandmother made household money by selling eggs and chickens, (when available) and they crocheted doilies and shawls and winter caps/hats, etc to stay above water back in the days when a dollar was worth a dollar but if you didn't have a dollar, you also didn't have food because there was no social security cushion.  Gawd that must have been stressful, in fact my grandfather died at the age of 55 when my grandmother was still quite a young woman although she never remarried.  She had opportunities but just never did.  I was only about 4 when he died but I remember it as if it were yesterday because it was my first funeral and I did not understand why I couldn't talk to him.

But back on point, this is fascinating information, I've always been a fan of the railways and I love to listen for the train whistle every afternoon and early evening and then again very early morning (around 4 or 4:30 each morning).

https://www.american-rails.com/roundhouse.html

My sons and I were also BIG fans of model railroads and we used to have a store in our local mall dedicated only to model railroaders.  There was also one store for model car enthusiasts but we were never into those too much, too many little bitty pieces to get lost!

My boys and I built a model railroad on top of our pool table (on a piece of fir) and it was so much fun.  I think I had more fun with it than they did!