OK, so I'm jumping the gun a little. I'm still cutting plastic for walls and dealing with windows and here I am talking details.
Sorry. Can't help it. Like many of my fellow railroad modelers, I like detail parts.
From Bob Clark's pictures of the freight office in the 1970s in the previous post, we can see quite a few of those in window air conditioners - and evidence that there were more sometime in the past. Sacramento has always had a habit of being really hot in the summer and this was one way to beat it. I've seen earlier pictures of this freight office that showed they used a combination of 1st floor awnings and these little air conditioning units.