. The street railway review . October 63,508 November .. 63,394 December .. 66,094 ,50499,670111,156108,072110,080107,088107,528112,630106,108118,812114,112718,382 ,,^^^,, Union Elevated other piece ,f of the loop, ha.; r-miles run ,68452,20050,, ,414 1,324,142 460,428 363,886 The greatest difficulty encountered with frogs and switches is theunequal wear due to the traffic being different on the four inner loop is used by the Metropoli
. The street railway review . October 63,508 November .. 63,394 December .. 66,094 ,50499,670111,156108,072110,080107,088107,528112,630106,108118,812114,112718,382 ,,^^^,, Union Elevated other piece ,f of the loop, ha.; r-miles run ,68452,20050,, ,414 1,324,142 460,428 363,886 The greatest difficulty encountered with frogs and switches is theunequal wear due to the traffic being different on the four inner loop is used by the Metropolitan and the South Side, andduring the last calendar year, 1900, at the frogs where these linesenter the inner loop were crossed by 1,500,000 wheels in one direc-tion and 2,650,000 wheels in the other direction. Where the Metro-politan crosses the outer loop there were 2,650,000 wheels in onedirection and 1,560,000 wheels in the other direction, the conditionsbeing a trifle more severe than at the other frogs mentioned. Tt ,-^. JlM o o o|o| .MOVAULE WING FROl AND SIIIFTINO l!AK. liber of the Lake Street and Northwestern intersections thewheels is 840,000 one way and 720,000 the other. When the loop was opened for traffic rolled steel frogs were used;under the somewhat lighter traffic these frogs would wear forabout ten months. In an effort to reduce the unevenness of frogsdue to the wide diflercnces in the number of wheels crossing in thetwo directions, the experiment was tried of using frogs with ma-chine steel points. With these frogs, however, the wear of the rails adjacent to the points was so much greater than the wear ofthe points themselves that shoulders formed and made a rougherriding track than the quicker wearing rolled frogs. The rolledsteel frogs now used wear for about seven months. In 1898 one cast steel frog was put down but liad to be removedalter 48 hours because it began to chip on the points. June I, 1900, two frogs having movable wings were instatled atthe n
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
