Railroads. Freight [and passenger] service operating statistics of class 1 steam railways in United States, compiled from 138 reports of freight service statistics representing 148 railways [and from 133 reports of passenger service statistics representing 143 railways] (switching and terminal companies not included), July 1935 and 1934 [and 7 months ended with July 1935 and 1934; prepared in] Bureau of Statistics.