. The street railway review . eely discussed and thecircumstances there warrant its consideration. Electric lightstations have long been established, either by private com-panies or by the city corporations. The question of electrictraction is just presenting itself and the engineers are care-full figuring on the cheapest as well as the best plans for itsinauguration. They have large and well equipped powerplants, to furnish electric light, with daj loads which arealmost negligable. Recognizing that the heavy service forstreet railway purposes are at times when the light load is aminimum thej
. The street railway review . eely discussed and thecircumstances there warrant its consideration. Electric lightstations have long been established, either by private com-panies or by the city corporations. The question of electrictraction is just presenting itself and the engineers are care-full figuring on the cheapest as well as the best plans for itsinauguration. They have large and well equipped powerplants, to furnish electric light, with daj loads which arealmost negligable. Recognizing that the heavy service forstreet railway purposes are at times when the light load is aminimum thej are trying to devise alterations in the machinerywhich will make it suitable for both systems. In London Lightning John H. Rider and Wilfred discuss this subject at some length. As far as pos-sible the same machinery must be used, so a summary ismade of the current installation. The systems can be clas-sified under three headings, viz.:—i. Continuous currentstations, generating at between 400 and 550 volts. 2. Con-. TaPTTr tinnous currents under 400 and over 550 volts. 3. Alternat-ing currents of any pressure but generallv 2,000 volts. Inthe first case either the 3 or 5 wire s^^stems are in use forlighting. The voltage is such that the machines can be useddirectly for street railway service, but the objection to thisis that one side of the lighting system would be permanentlvconnected to earth by the rail return. The railway servicemust not be supplied direct from a machine which is feedingthe lighting system, but it may be supplied indirectly throughthe medium of a motor-generator, used simply for the pur-pose of keeping the traction and lighting mains permission could be obtained either from the municipalauthorities or from the underwriters for an earth connection,the best plan would be to ground the middle conductor, as isthe case in Manchester. For the second class of stations, voltages under 400 orover 550 are unsuited for street railway work. Machin
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
