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I picked up an old horn by controller once that had a built-in sound box trying to mimic diesel engines back in the 70s. It buzzed more than anything but you could tell they were reaching for realism long before DCC made it simple. I have also seen some lionel accessories with wild mechanical gimmicks moving workers loading crates way before anyone thought of synchronized animation funny.
How some of those ideas got dropped then came back decades later with better tech.