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 nine overhead clearance must be maintained so so the Ithe high high- voltage current will not jump from the trolley wire to the shipment and cause a short circuit says Colliers In cases where this clearance is decreased by the lower wires in tunnels and under bridges the power is shut off oft as os a safety measure measure measure meas meas- ure and the train h has s to coast or orbe orbe orbe be pushed or pulled by a steam engine through and under them |