. Railway maintenance engineering, with notes on construction . a;> o o 02 5=1 c2. 6 o C -2 <+H H o JX! 02 a; ^ ^ % A X o S 02 TJ S CO C3 O T3 T—1 a . c« c l-H o 02 (P ^ O a HH • S m C^ BALLAST 183 grade, inasmuch as the stones penetrate into the grade, and theyielding soil will swell into the spaces, thus making the drainageineffective. The effect of overloading the subgrade and the unequal dis-tribution of the pressure from the ties is very clearly shown inFig. 107. Mr. Thomas H. Johnson has made a study of Director Schu-bert^s report with a view to deriving a formula which would

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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915