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 177 steam roads, switching and terminal companies not included), May, 1923 and 1922, and 5 months [ended with May] 1923 and 1922; [prepared in] Bureau of Statistics.

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