. The street railway review . and height of chair, if chairs are used, plus thespace allowed for tamping. The condition of the soil must govern thelatter exclusively, but in the reconstruction of the roadbed, where theoperation of cars will permit,<and in all new work, unless the soil is of asandy character, the following plan will not only provide a suitable sub-drainage, but insure permanence; remove all earth to a depth of S inchesbelow the bottom of the cross-tie the full width of the trench; then rollthoroughly with a heavy four-horse or steam roller; then spread witli alaver of cinder
. The street railway review . and height of chair, if chairs are used, plus thespace allowed for tamping. The condition of the soil must govern thelatter exclusively, but in the reconstruction of the roadbed, where theoperation of cars will permit,<and in all new work, unless the soil is of asandy character, the following plan will not only provide a suitable sub-drainage, but insure permanence; remove all earth to a depth of S inchesbelow the bottom of the cross-tie the full width of the trench; then rollthoroughly with a heavy four-horse or steam roller; then spread witli alaver of cinders, crushed rock, gravel or furnace slag, from 6 inches to Sinches in thickness, and again roll until the same is well bedded andleveled. A trench 7 feet in width, with a layer of S inches, will requirefor one mile in length 24,640 cubic feet of material, estimated at ^Acents^$S62 40, and will require the removal of 912 yards of earth, esti-mated at 25 cents ^ I22S; add for rolling, fjo. Totaf, $1,140 per mileof single GEO. W. BAUMHOFF, ST. LOUIS. The fact that the material so placed provides a splendid sub-drajnageis the best argument in its favor, and one that will commend its adoptionwhere soil demands it; for it must be remembered that it is far moreexpensive to open up and re-tamp poorly constructed track than to prop-erly construct and provide with sub-drainage at the outset. For surfacing, care should be taken to procure machine-crushed rockor gravel, as it insures a more even bed under the tie than —Cross Ties. Under this heading we have the metalic tie and various kinds of committees remarks will be confined to the latter exclusively, forit will be seen bv reference to the former reports on track repairs andconstruction, made to this Conventon, that the life of a wood tie whenburied to a depth of 8 inches or more is the best argument in favor of itsadoption, as against the former. The various kinds of wood, and dis-cussion of dur
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
