The optimum depth of ballast. An analysis of the quantities and distribution of chippings used as packing under the sleepers in a section of railway with different depths and types of ballast (E-125)

Report E.99 dated 17th April, 1956, gave the results of an analysis of manhours spent in maintaining a section of railway incorporating different depths and types of ballast. [text omitted as illegible] was made that an analysis of the quantity and distribution of chippings a used for packing the...