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Trolleybuses make use of a second parallel overhead line for that return, and two trolley poles, one contacting Every single overhead wire. (Pantographs are generally incompatible with parallel overhead traces.) The circuit is finished by making use of both of those wires. Parallel overhead wires also are utilised around the exceptional railways wi

(Sometimes the sections are run with different voltages or frequencies.) The grids may very well be synchronised on a traditional basis, but events may possibly interrupt synchronisation. This isn't a problem for DC systems. AC devices have a certain basic safety implication in the railway electrification technique would work as a "Backdoor" link a