. The Street railway journal . ion of a design ofthis character, the problem then is how bestto modify the present design so as to reducethe noise to the greatest possible extent with-out making the cost prohibitive. There are tour primary causes of thenoises of the loop, which are as follows: 1. Imperfect track construction. 2. Imperfect rolling stock. 3. Imperfect roadbed. 4. Defects in structure, (a) Elasticity of the steel; (b) lackof rigidity. IMPERFECT TRACK CONSTRUCTIONThe track when built in 1895 was laid with 80-lb. steel railsupon light tie plates, and provided with all necessary spe
. The Street railway journal . ion of a design ofthis character, the problem then is how bestto modify the present design so as to reducethe noise to the greatest possible extent with-out making the cost prohibitive. There are tour primary causes of thenoises of the loop, which are as follows: 1. Imperfect track construction. 2. Imperfect rolling stock. 3. Imperfect roadbed. 4. Defects in structure, (a) Elasticity of the steel; (b) lackof rigidity. IMPERFECT TRACK CONSTRUCTIONThe track when built in 1895 was laid with 80-lb. steel railsupon light tie plates, and provided with all necessary specialwork for operating the trains in and out of the loop, and solong as the joints of the track remained new and in good con-dition the noise was not excessive, after the inequalities inci-dent to the opening of a new line of track had worn off, exceptat the junction points and on cross-overs, where many frogsand switches were necessarily placed. As the track becameworn and the joints hammered, the noise began to increase, and. FIG. 10.—TRANSVERSE SECTION UF PRESENTSPAN TYPICAL LOOP cars, as shown, the noises produced by the wheels upon thejoints and by other working parts of the train would be largelyconfined to the space underneath the train, and would to a cer- £/evaf/on ELEVATION OF SUGGESTED CONCRETE STRUCTURE it has continued to increase until the present time, when it isalmost unbearable in certain places, and especially at the junc-tion points. The present condition of the track is largely dueto the failure of the tie plates, which proved to be too light forthe duty imposed upon them. As the hammering of the wheels over the joints is the chiefsource from which noise is imparted to the structure, it is of March 18, 1905.] STREET RAILWAY JOURNAL. 523 vital importance that these joints and the entire track be builtin as thoroughly first-class manner as possible, and maintainedin this condition. It seems almost impossible to procure a typeof joint over which a heavily lo
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
