Comment by tdeck
If anyone is interested in telephone exchange technology at all, I highly recommend checking out the Connections Museum in Seattle. They have multiple eras of electromechanical switching equipment up and running, and a huge collection of cool old phones, teletypes and payphones. They also have a great YouTube channel with very knowledgeable people.
https://www.telcomhistory.org/ConnectionsSeattle.html
https://m.youtube.com/@ConnectionsMuseum
I feel like they're not well known and there's no place like it!
Another excellent museum is the Kodiak Military History Museum at Fort Abercrombie, on Kodiak Island, Alaska.
It has some old working telephone and teletype systems. You can watch the physical switching equipment do its magic. It is truly awesome. The raw speed and accuracy of the mechanical systems is almost unbelievable.