. The street railway review . nd resting on tie plates, are joined by 6-bolt fish plateswith tie rods at every joint. Oak ties, 8 ft. long, are spaced2 ft. between centers and rest on 6 in. of gravel ballast. Theconstruction, with the absence of trolley wires and railbonds, appears as though it were intended for steam traffic. The power station is worthy of note, for it is certainlydifferent in many respects from any other railway is not necessary to locate the power house at the centerof gravity of the system to get the most economical cur-rent distribution, so a site was selected
. The street railway review . nd resting on tie plates, are joined by 6-bolt fish plateswith tie rods at every joint. Oak ties, 8 ft. long, are spaced2 ft. between centers and rest on 6 in. of gravel ballast. Theconstruction, with the absence of trolley wires and railbonds, appears as though it were intended for steam traffic. The power station is worthy of note, for it is certainlydifferent in many respects from any other railway is not necessary to locate the power house at the centerof gravity of the system to get the most economical cur-rent distribution, so a site was selected at 88th street andVincennes avenue, convenient to the Rock Island railroad,and where land is cheap and transportation for fuel view of the building is shown m Fig. i. Car tracks runthrough the loggia, and above this are the offices, lockerroom, shower baths, toilet rooms and waiting rooms forthe employes. Fig. 2 is from a photograph of one,of the engines directconnected to two of the generators, with the switchboard in. FIG. I.—CAR BARN AND STATION. the background. Unlike street railway stations in gen-eral, the dynamos are not all of the same voltage, for it isnecessary to have three circuits of different potential tocharge the batteries properly. Four 6-pole, 190-k. w., shuntwound Walker generators, with a variable voltage between160 and 190, were installed. This is the ultimate dynamocapacity of the station, the fourth machine being held inreserve. The dynamos are direct connected to two 250-h. p. Willans engines, the kind so generally used in theelectric power stations of Great Britain. These two enginesare at either end of the room, and a third one, of 500-h. p.,will be put in the center. To give the most flexible arrange-ment the Arnold system of power station construction wasadopted. A solid shaft with couplings extends from oneengine to the other. The armatures of the generators arefixed to quills which are free to rotate about the solid makes a very
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
