The Eheim overhead came in two generations - the first was a metal strip and probably scaled near a foot high. The later version was wire, about 3" diameter. (I have a loop of this). The switches and crossings for the system were absolutely huge. The shoes on the trolley poles were the size of rail joiners, well code 70 rail joiners.
The buses had the trolley poles mounted at the front so that they could steer the front axle.
Working TB overhead might be tricky, as the two wires need to be insulated. Might be possible with micro-filament fishing line.