. Electric railway journal . OLIVER*35 A0 - TO OCEAN PARK THREE-WIRE SYSTEM—DIAGRAM SHOWING POSITIVE AND NEGATIVE TROLLEYS AND FEEDERS 396 ELECTRIC RAILWAY JOURNAL [Vol. XLVII, No. 9 approximately zero. After the system was placed inoperation it was found necessary to shift the locationof one set of sectional insulators slightly to secure thisresult. At Brush Canyon there are a number of motorsoperating a stone quarry and connected between trolleyand rails. These motors take about 400 amp., whichwas formerly all returned through the rails to Olive and. THREE-WIRE SYSTEM—VOLTMETER CHART FOR TWE
. Electric railway journal . OLIVER*35 A0 - TO OCEAN PARK THREE-WIRE SYSTEM—DIAGRAM SHOWING POSITIVE AND NEGATIVE TROLLEYS AND FEEDERS 396 ELECTRIC RAILWAY JOURNAL [Vol. XLVII, No. 9 approximately zero. After the system was placed inoperation it was found necessary to shift the locationof one set of sectional insulators slightly to secure thisresult. At Brush Canyon there are a number of motorsoperating a stone quarry and connected between trolleyand rails. These motors take about 400 amp., whichwas formerly all returned through the rails to Olive and. THREE-WIRE SYSTEM—VOLTMETER CHART FOR TWENTY-FOURHOURS BETWEEN TRACK AT HOLLYWOOD FREIGHT STATIONAND NEUTRAL BUS AT OLIVE SUBSTATION Sherman substations. When the three-wire systemwas put in effect, one-half of these motors were put on apositive feeder and one-half on a negative feeder sothat this load was almost entirely removed from therails. At Pasadena and Altadena substations the general arrangement is similar to that at Olive and neither Pasadena nor Altadena substations was itnecessary to install any additional equipment in orderto make use of the three-wire system. Results Secured by the Use of the Three-Wire System The large chart on this page shows the voltage condi-tions which obtained in the track between Olive andSherman substations before and after the use of thethree-wire system. It will be seen that with the use ofthis system the track voltage has been very greatly re-duced. There are still voltage swings in the track ofconsiderable magnitude, but they rev
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