Timeline of Class I railroads (1910–1929)
Open-knowledge reference entry

The following is a brief history of the North American rail system, mainly through major changes to Class I railroads, the largest class by operating revenue.
1910
July 1: The first year of classification by operating revenue begins.
July 1: The property of the independent Chicago, Cincinnati and Louisville Railroad, which entered receivership on February 14, 1908, is conveyed to the Chesapeake and Ohio Railway of Indiana, a subsidiary of the Chesapeake and Ohio Railway.
December 23: The property of the Oregon Railroad and Navigation Company is sold to the Oregon-Washington Railroad and Navigation Company, remaining a subsidiary of the Oregon Short Line Railroad (Union Pacific Railroad system).
1911
January 1: The Chicago, Terre Haute and Southeastern Railway begins operations after acquiring the properties of the Southern Indiana Railway and subsidiary Chicago Southern Railway, which entered receivership on August 19 and August 25, 1908, respectively.
February: The New York Central Railroad sells half of its majority interest in the Rutland Railroad to the New York, New Haven and Hartford Railroad.
April 20: The Blacklick and Yellow Creek Railroad changes its name to Cambria and Indiana Railroad (not yet Class I).
June 30: The first year of classification by operating revenue ends. There are 177 Class I railroads, including two Canadian companies (Canadian Pacific Railway and Canadian Northern Railway) not included in any totals by the ICC, and a separate listing for "Canadian Pacific Lines in Maine" (leased lines of the International Railway of Maine, Aroostook River Railroad, and Houlton Branch Railroad). Grand Trunk Railway of Canada lessor Atlantic and St.
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