Washed gravel ballast for heavy traffic conditions; use of washed material reduces maintenance costs; sand can be used for raising tracks to grade; economic factors favor use of prepared ballast; furnish material up to specifications. Paper presented before Nat. Sand and Gravel Assn. (see also Nat. Sand and Gravel Bul., vol. 11, no. 2, Feb. 15, 1930, p. 47 and Pit and Quarry, vol. 19, no. 12, Mar. 12, 1930, pp. 71 and 73)
Gravel ballast for railroad purposes
Rock Products
Rock Products ; 33 , n 3
1930
Article (Journal)
English
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The use of gravel as railroad ballast
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