. Official proceedings . same ason the Pennsylvania Railroad. This current, by means of aphase splitter on the locomotive, is converted into three-phasecurrent and thus operates the three-phase induction motors onthe locomotives. Should this system be hereafter decided tobe best adapted to the niountain division of the PennsylvaniaRailroad and the electrification at Philadelphia extended thisfar, no confusion will result as the single-phase and three-phaselocomotives are both supplied with the same kind of currentand voltage. When the mercurv arc rectifier becomes com-mercial for large powers,
. Official proceedings . same ason the Pennsylvania Railroad. This current, by means of aphase splitter on the locomotive, is converted into three-phasecurrent and thus operates the three-phase induction motors onthe locomotives. Should this system be hereafter decided tobe best adapted to the niountain division of the PennsylvaniaRailroad and the electrification at Philadelphia extended thisfar, no confusion will result as the single-phase and three-phaselocomotives are both supplied with the same kind of currentand voltage. When the mercurv arc rectifier becomes com-mercial for large powers, direct current motors can also be usedwith the same distribution and contact system, thus making allthree kinds of locomotives operative under the same overheadsystem. , By far the most extensive main line electrification thus farin the world is that of the New York, Xew Haven and HartfordRailroad. It has now installed loi locomotives of all kinds and 265 2 o■-1 3 9po i 03 is: 00 3OOP o oo c *vc H. 69 multiple unit cars. It has upwards of 500 miles of trackelectritied, including its Harlem Division Yards, among thelargest freight yards in the world. Its electric locomotive equip-ment includes high speed locomotives for passenger service,large locomotives designed either for heavy freight or veryheavv express passenger .■••ervice and many slow speed switch-ing locomotives especially designed for that service with controlso nicely regulated that damage to cars and lading in switchingservice has Ijeen remarkal)l_\ reduced. The latest completed electritication is tliat of the Norfolkand Western }. This ditlers iron-; the New Haven inbeing a mountain grade electrification for handling very heavyfreight service on such grades almost exclusively. Here thelocomotives are of verv large capacity—in fact they are thelargest locomotives, from the point of horsepower capacity,Avhich have yet been built—either steam or electric. In hauling the regular trains of 3250 tons
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