I had the good fortune to go inside a Pac Bell switch. Inside was an entire floor of 2-post relay racks housing… wait for it… relays. The click clacking was mus

I had the good fortune to go inside a Pac Bell switch. Inside was an entire floor of 2-post relay racks housing… wait for it… relays. The click clacking was music to my ears. Phone system switching predated transistors and computers. Weren’t early MIT based SWE also model railroaders? I think there is some connection there between model railroad switching, relays and logic.