Railroads. Freight and passenger service operating statistics of class 1 steam railways in United States, compiled from 157 reports of freight service statistics representing 168 railways and from 151 reports of passenger service statistics representing 162 railways (switching and terminal companies not included), May, 1928 and 1927 [and 5 months ended with May, 1928 and 1927; prepared in] Bureau of Statistics.

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