Apparatus and instruments for conducting, switching, transforming, accumulating, regulating, controlling, or inductively transferring electricity in conveyance systems, namely, buses, power supply modules, power pickups, cable holders, wires; software for controlling and maintaining conveyance systems; positioning and travel-measurement systems, consisting of distance sensors, position sensors, switches, limit switches, optical scanners, safety relays, speed monitors, transponders, transponder readers, and coded metal or plastic electric conductor rails; positioning and travel-measurement systems, namely, electronic dispensed-cable-length transducers; controllers, consisting of electronic equipment for assuming control of, controlling, powering, and transmitting data to suspended overhead electric-monorail vehicles and electric ground-transport vehicles; remote controls for controlling movements of conveyance systems; absolute-positioning systems for position determinations, consisting of distance sensors, position sensors, switches, limit switches, optical scanners, safety relays, speed monitors, transponders, transponder readers, and coded metal or plastic rails; rail-bus and wire-bus systems consisting of processor-controlled data concentrators, inverter controls, position sensors, anti-collision proximity switches, magnetic switches, stop switches, limit switches, optical scanners, transponders, transponder readers, and infrared destination markers, serving as interfaces both between system programmable logic controllers and mobile electronic controllers mounted on conveyors and among one another