@JackEric You're talking about trolley buses. Quick question; how much do you think maintaining, repairing, and retensioning the overhead wires costs? And what happens if something snags and tears down the wires? Pay special attention to passing pedestrians and bicycles dealing with the 600 volt unshielded power ...
@cstross Trolley buses, trams, suburban rail, high-speed rail. There is not the street capacity to sustain personal-car-as-the-norm. Not aware that the OLE is a particular hazard, and the installation and maintenance cost of OLE rapidly breaks even vs the cost of sustaining and maintaining an on-board power supply on every vehicle