. The Street railway journal . urrent system may not beapplicable, but such conditions are unusual, and require the mostcareful consideration in order not to be led astray. At all times the water supply, as to quantity, quality and relia-bility, and the obtaining of fuel, must be considered. Other considerations frequently arise in the design of a road thatconsiderably affect the solution of the question under consideration,and sometimes they determine definitely the answer, but the fore-going are the most usual determining factors. The location of the power house, and the sub-stations, if alt
. The Street railway journal . urrent system may not beapplicable, but such conditions are unusual, and require the mostcareful consideration in order not to be led astray. At all times the water supply, as to quantity, quality and relia-bility, and the obtaining of fuel, must be considered. Other considerations frequently arise in the design of a road thatconsiderably affect the solution of the question under consideration,and sometimes they determine definitely the answer, but the fore-going are the most usual determining factors. The location of the power house, and the sub-stations, if alter-nating current be used, may be discussed for both direct current andalternating current under the same general heads, but the applica-tion of the reasoning in the two cases makes it preferable to con-sider each separately. Since a road with more than one direct-current power house is 0 r. 10 20 30 40 _ _ ^^..yi^—^ ^0 - Vv^ - ^ 1 ■ . 1 1 1 1 I I , 1 1 • I I—I—•—•—•—►—.—1 100 150 200. Street ;: FIG. I—TRAIN DIAGRAM AND ROAD PROFILE to-day, and is becoming more and more a design to meet specialand unusual conditions, in the following only one power housewill be considered for direct-current roads. If the use of direct-current generators is decided upon, the economy of power de-mands that the power house be located at the center of gravityof the system. The center of gravity is continually shifting withthe changing location of the cars on the road, and depends uponthe amount of current each is taking, and this rapidly varies be-tween zero and a maximum of two or three times the the train diagram this center of gravity can be readily de-termined for different location of cars, and an average found formost economical location of power house. Where the road is tohave a future extension not of sufficient length to justify analternating-current installation, due consideration must be givensuch extension when locatin
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
