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4, many years ago in Dayton Ohio. Basically electric buses with overhead gantries for power. Zzzt. Quiet, no smelly diesel. (Buses around central Ohio mostly run on CNG now, so no stink at all.)
Light rail, but not in the US.
Subways, in various cities and countries. Pre-map-apps, so easy to ride to where you want as long as you know what it's next to...
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