Most trolleybuses I know have independent emergency propulsion and can reattach without too much difficulty at specific places (usually stops). So temporary sho

Most trolleybuses I know have independent emergency propulsion and can reattach without too much difficulty at specific places (usually stops). So temporary short rerouting isn't difficult. Apparently they even have trolley/battery hybrids in zurich where the battery is used as part of normal operation (claiming to need wires only for ~half of the route).