. Electric railway journal . messenger cable having a safetensile strength of 12,000 lb. is suspended from insulatorson brackets with 150-ft. spans and anchored every mileon straight track and at the end of every curve. On curvesthe standard construction was modified by stringing a5/16-in. galvanized steel cable between the supports whichserves as a spring guy, to which Y^-m. pull-off bridles areattached at 15-ft. intervals, thus making a very smoothcurve. Section insulators are provided at every substation sothat the overhead wire can be cut out between any twostations without affecting the r
. Electric railway journal . messenger cable having a safetensile strength of 12,000 lb. is suspended from insulatorson brackets with 150-ft. spans and anchored every mileon straight track and at the end of every curve. On curvesthe standard construction was modified by stringing a5/16-in. galvanized steel cable between the supports whichserves as a spring guy, to which Y^-m. pull-off bridles areattached at 15-ft. intervals, thus making a very smoothcurve. Section insulators are provided at every substation sothat the overhead wire can be cut out between any twostations without affecting the rest of the line. The contactwire is of No. 0000 hard-drawn copper, suspended fromthe messenger at intervals of 15 ft., and is fed with a500,000-circ. mil copper feeder over the heaviest gradesfor 7 miles out of Portland, and from there on with a copper feeder tapping into the contact wire at every10th pole. The insulation of all catenary construction is designedfor 1500 volts, so that later, when the traffic becomes. Oregon Railway—Tapping Transmission Wire at Substation heavier, this voltage can be used by changing the car mo-tors and converters, thereby increasing to a very largeextent the power-carrying capacity of the entire systemwithout disturbing in any way the overhead feeder ortrolley installation. SUBSTATIONS The direct-current distribution system is supplied withenergy through synchronous converter substations. Fiveof these stations were built and feed the middle sections ofthe line, while the ends of the line are fed from substa-tions belonging to the local power companies in Portlandand Salem. The substations are built of reinforced concrete, withcorrugated galvanized iron roofing carried on steel rooms and ticket offices are provided in each sub-station, the attendant acting as electrician, station agentand telegraph operator. The building is divided into two parts: the high-tensioncompartment, which contains the lightning arresters, dis-co
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