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 166 reports representing 182 steam roads, switching and terminal companies not included), July, 1922 and 1921, and 7 months [ended with July] 1922 and 1921; [prepared in] Bureau of Statistics.

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