Electrical news and engineering . hase OperationThree-phase railway operation may be considered assuited for certain conditions in main or trunk line heavyservice only; and for the purpose of this article, the scopeof alternating current in railway service will be consideredas applying to single-phase operation for both passengerand freight service on interurban lines, local systems serv-ing a comparatively wide territory, and main lines. is simple and economical, and a high efficiency is first great economy of single-phase system is inthe first cost of installation, whether power
Electrical news and engineering . hase OperationThree-phase railway operation may be considered assuited for certain conditions in main or trunk line heavyservice only; and for the purpose of this article, the scopeof alternating current in railway service will be consideredas applying to single-phase operation for both passengerand freight service on interurban lines, local systems serv-ing a comparatively wide territory, and main lines. is simple and economical, and a high efficiency is first great economy of single-phase system is inthe first cost of installation, whether power be generatedor purchased. The first cost of rotary converters and in-termediate feed wires is dispensed with, and a further sav-ing is effected in first cost of sub-stations. Instead of com-paratively large buildings at frequent intervals, the single-pliase system requires only small sub-station buildings axlong intervals. These need be nothing more than sheltersfor transformers and in many cases outdoor transformersmay be I .Single phase, 3,300 volts—.SI. Clair TunnelSingle-phase alternating current operation has greatlyextended the profitable field of electric motive power. Itis especially adapted to handling passenger and freighttrains (heavy or light) over long distances and to interurbanservice with either single cars or multiple unit trains. It isonly under exceptional circumstances that it may, at pre-sent, be considered economical for street railway operationin the compact distribution systems of cities and towns. Transmission and distribution of energy from powerplants to moving cars or trains by the single-phase system
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