Railroads. Freight [and passenger] service operating statistics of class 1 steam railways in United States, compiled from 140 reports of freight service statistics representing 148 railways [and from 135 reports of passenger service statistics representing 143 railways] (switching and terminal companies not included), Feb. 1935 and 1934 [and 2 months ended with Feb. 1935 and 1934; prepared in] Bureau of Statistics.