Long story short, I visited a tower. A-T-T tower, the big square type with the black microwave cones on the sides. Fellow we were visiting had the keys, so the visit was legal. Couldnt climb it as it was getting dark. Did go into the control building, all concrete. Most of the equipment was gone, save some big panels of vacuum tubes. What he needed to inspect was ok, then asked if I wanted to see the genererator. Sure, in another room were more control panels. In deeper was a huge stand for the diesel and generator. Temp, oil gauges, big manual controls very large cartridge fuses , just as it was set up. Inside a panel was a certified sticker, date........5-1952!! The engine, Detroit Diesel, 2-71 or 2-53 thereabouts. Output ,,30kilowatts. Unbelieveable, complete, never rained on screaming jimmy, that looks ready to fire up again. Fuel tank is gone, oil looked good, needed a ladder to look in the radiator, so couldnt. Controller above the generator had 15+ snap switches with contacts. Ceiling is one foot of poured concrete. No evidence of water damage anywhere. Time capsule, I think it could be slid out the walk door. Interesting, very interesting