. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . 65. Effect of sodding the slopes, etc. Engineers are unani-mously in favor of rounding off the shoulders and toes ofembankments and slopes, sodding the slopes, paving the ditches,and providing tile drains for subsurface drainage, all to be putin during original construction. (See Fig. 43.) Some of thehighest grade specifications call for the removal of the top layerof vegetable soil from cuts and from under proposed fills tosome convenient place, from whic
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . 65. Effect of sodding the slopes, etc. Engineers are unani-mously in favor of rounding off the shoulders and toes ofembankments and slopes, sodding the slopes, paving the ditches,and providing tile drains for subsurface drainage, all to be putin during original construction. (See Fig. 43.) Some of thehighest grade specifications call for the removal of the top layerof vegetable soil from cuts and from under proposed fills tosome convenient place, from which it may be afterwards spreadon the slopes, thus facilitating the formation of sod from grass-seed. But while engineers favor these measures and theireconomic value may be readily demonstrated, it is generallyimpossible to obtain the authorization of such specificationsfrom railroad directors and 2)i*C)moters. The addition to theoriginal cost of the roadbed is considerable, but is by no meansas great as the capitalized value of the extra cost of mainte-nance resulting from the usual practice. Fig. 43 is a copy of ^e5. EAHTUWORK. 71. PROPOSED SECTION OF ROADBED IN EXCAVATION.
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