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Show Electrification Presents Some Difficult Problems When a large piece of equipment is transported over an electrified section of an American railroad, a nine-inch overhead clearance must be maintained so the high-voltage high-voltage current will not jump from the trolley wire to the shipment and cause a short circuit, says Collier's. In cases where this clearance is decreased by the lower wires in tunnels and under bridges, the power is shut off as a safety measure meas-ure and the train has to coast or be pushed or pulled by a steam engine through and under them. |