. Electric railway journal . d this depth inadequate owingto local soil conditions and have increased the depth to8 in., particularly where the resilient type of track con-struction is employed. In any type of construction whereconcrete is employed as a foundation the aggregate is 1 .1 ■ I il: l: II .I I !: 1 : I !■ I ■ I: :l II ^ II . i1 11 : .i M :l! II .i! .! ,1 II I1 ■ II Ml1 M. M !, II Mi. II: ■ : ,i: !h h II I!. _ I October 4, 1913. ELECTRIC RAILWAY JOURNAL 527 usually deposited as wet as practicable and should bewell puddled so that all voids are rilled. Where it is impossible to divert
. Electric railway journal . d this depth inadequate owingto local soil conditions and have increased the depth to8 in., particularly where the resilient type of track con-struction is employed. In any type of construction whereconcrete is employed as a foundation the aggregate is 1 .1 ■ I il: l: II .I I !: 1 : I !■ I ■ I: :l II ^ II . i1 11 : .i M :l! II .i! .! ,1 II I1 ■ II Ml1 M. M !, II Mi. II: ■ : ,i: !h h II I!. _ I October 4, 1913. ELECTRIC RAILWAY JOURNAL 527 usually deposited as wet as practicable and should bewell puddled so that all voids are rilled. Where it is impossible to divert traffic from a trackbeing rehabilitated some engineers have adopted the planof installing crushed-rock foundations temporarily, to be tion is to provide a perfect track surface. As a rule thetrack is lined and surfaced with wood blocks, and theconcrete is poured in around the ties up to paving founda-tion level. As the concrete sets and the moisture evapo-rates from the tie, the concrete is apt to shrink away from. Type No. 3 Track of Chicago City Railway AfterTamping Ballast followed by concrete. After the rock has been tampedthoroughly and the weak spots revealed by operatingregular service over the open track, a rich grout mixtureis poured into the voids. While this method has not been Grouted Paving Along Rails with Space Between Readyfor Asphalt Filling, Chicago City Railway the tie, particularly if it is untreated, and this leaves thetrack supported only on the blocks. When traffic isturned on to the track the blocking settles until the tiebears on the concrete. This starts a movement
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