. The Street railway journal . FIGS. 7 AND 8.—ROADBED OF BERLIN ELEVATED RAILWAY a design is shown in Figs. 11 and 12; but to change the presentstructure into one resembling such a form is a difficult and ex-pensive task. In analyzing the relative merits of different classes of con-struction, the fact should not be lost sight of that the noisecomes primarily from the trains, and a large part of this noise 522 STREET RAILWAY JOURNAL. [Vol. XXV. No. if. cannot be eliminated entirely, no matter how good the design ofthe structure, and the best, therefore, that can be expected isto minimize the no
. The Street railway journal . FIGS. 7 AND 8.—ROADBED OF BERLIN ELEVATED RAILWAY a design is shown in Figs. 11 and 12; but to change the presentstructure into one resembling such a form is a difficult and ex-pensive task. In analyzing the relative merits of different classes of con-struction, the fact should not be lost sight of that the noisecomes primarily from the trains, and a large part of this noise 522 STREET RAILWAY JOURNAL. [Vol. XXV. No. if. cannot be eliminated entirely, no matter how good the design ofthe structure, and the best, therefore, that can be expected isto minimize the noise caused by the operation of the trains, to. FIG. 9.—SIDE ELEVATION AND PLAN OF PRESENT TYPICAL LOOP SPAN the graatest possible extent, and prevent it being intensified bythe supplemental action of a vibrating or ringing structure. The structure shown in Figs, n and 12 would be built ofstone or concrete reinforced with steel parts embedded in theconcrete, similar to the methods now becoming so generallyutilized in the construction of railway bridges, buildings andother structures. The use of concrete would eliminate almost all of the diffi-culty encountered with the present structure due to vibration,and if, in addition, the structure were carried up solid on eachside of each track to a point slightly above the bottoms of the 1
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
