. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . Gravel, cinders, chats, etc. Cementing gravel and 108.—Cross-sections of Ballast for Class C Roads. 199. Methods of laying ballast. The cheapest method oflaying ballast on new roads is to lay ties and rails directly onthe prepared subgrade and run a construction train over thetrack to distribute the ballast. Then the track is lifted up untilsufficient ballast is worked under the ties and the track is prop-erly surfaced. This method, although cheap, is apt to injuret
. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . Gravel, cinders, chats, etc. Cementing gravel and 108.—Cross-sections of Ballast for Class C Roads. 199. Methods of laying ballast. The cheapest method oflaying ballast on new roads is to lay ties and rails directly onthe prepared subgrade and run a construction train over thetrack to distribute the ballast. Then the track is lifted up untilsufficient ballast is worked under the ties and the track is prop-erly surfaced. This method, although cheap, is apt to injurethe rails by causing bends and kinks, due to the passage ofloaded construction trains when the ties are very unevenly androughly supported, and the method is therefore condemned andprohibited in some specifications. The best method is to drawin carts (or on a contractors tempora^-y track) the ballast thatis required under the level of the bottom of the ties. Spreadthis ballast carefully to the required surface. Then lay the tiesand rails, which will then have a very fair surface and uniformsupport. A construction train can then be run on th
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