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), Mar. 1923 and 1922, and 3 months [ended with Mar.] 1923 and 1922; [prepared in] Bureau of Statistics.

Tools