Railroads. Freight and passenger train service unit costs (selected expense accounts) of class 1 steam roads in United States, including proportion of mixed-train and special-train service (compiled from 164 reports representing 180 steam roads, switching and terminal companies not included), Oct. 1921 and 1926 and 10 months [ended with Oct.] 1921 and 1920; [prepared in] Bureau of Statistics.

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