. Electric railway journal . ries. An articlein the Electric Railway Journal of July 8, 1916, con-tributed by T. Norman Jones, Jr., chief engineer of theVirginia Railway & Power Company, Richmond, Va.,indicated that corrugation was not as prevalent on aballasted track foundation as on track laid on a concretefoundation. Since practically all of the track laid inChicago since 1907 is about equally divided between tained track lard in all years from 1908 up to the pres-ent time. The location and the amount of corrugationwere observed from the front platform of a car, a recordbeing compiled en ro
. Electric railway journal . ries. An articlein the Electric Railway Journal of July 8, 1916, con-tributed by T. Norman Jones, Jr., chief engineer of theVirginia Railway & Power Company, Richmond, Va.,indicated that corrugation was not as prevalent on aballasted track foundation as on track laid on a concretefoundation. Since practically all of the track laid inChicago since 1907 is about equally divided between tained track lard in all years from 1908 up to the pres-ent time. The location and the amount of corrugationwere observed from the front platform of a car, a recordbeing compiled en route. In selecting the two routes,every effort was made to have them as near comparableas possible, both as regards the average age and theamount of traffic. This was practically impossible, how-ever, and, as indicated in the tabulations, the trackon concrete foundations averages about one-half yearolder than that on the ballasted foundation, and theaverage traffic over the concreted track was somewhat 9 SH Track Centers-. CHICAGO TRACK STUDIES—TYPE 2, CONSTRUCTION WITH CONCRETE IN STRINGERS UNDER RAILS these two types of construction, it offered a particularlyfine opportunity to determine the merits of ballast andconcrete foundations in their relation to rail corruga-tion. Accordingly, George Weston, engineer for theBoard of Supervising Engineers Chicago Traction, hada survey made of 36 miles of street, or approximately72 miles of single track, which was about equally dividedbetween that laid on solid concrete and that laid oncrushed-stone ballast. The results of this survey, whichwas made by C. S. Holcomb, assistant engineer, indi-cate that there is no particular advantage between these heavier than that over the track laid on crushed other words, the conditions under which the surveywas made were more favorable for the ballasted con-struction than for the concrete. Discussion of Data It will be observed in the tabulations on page 1013that the amount and character o
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