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Events
January events
- January 9 – The Østfold Line in Norway takes electric traction into use between Ås and Dilling.
- January 14 – Atchison, Topeka and Santa Fe Railway discontinues the San Francisco-Los Angeles-Chicago Navajo.
- January 27 – The Boston, Revere Beach and Lynn Railroad ceases operations in Massachusetts in preparation for abandonment.
- January 29 – Three gasoline-powered trains carrying factory workers crash and explode while approaching Ajikawaguchi Station, Yumesaki Line (Nishinari Line), Osaka, Japan, killing at least 181 people and injuring at least 92.
February events
- February – Electro-Motive Corporation introduces the E5.
March events
- March 29 – Southern Pacific Railroad runs its last passenger train to Fremont-Centerville, California.
May events
- May 1 – The Østfold Line in Norway takes electric traction into use between Dilling and Fredrikstad.
- June 29 – Syracuse Transit Corporation closes the South Salina and Nedrow lines in Syracuse, New York.
- June 30 – Last day archbar freight trucks can legally operate in U.S. Interchange service (and then only on empty cars returning to their home roads).
- June – Chicago, Rock Island and Pacific Railroad takes delivery of the unique EMC AB6 locomotives.
July events
- July 1 – Portions of the SNCF in Alsace-Lorraine are incorporated into the Deutsche Reichsbahn.
- July 15 – The Østfold Line in Norway takes electric traction into use between Fredrikstad and Sarpsborg. and the Compagnie Internationale des Wagons-Lits' Taurus Express begins to run throughout between Haydarpaşa Terminal, Istanbul, and Baghdad Central Station.
- July 29 – Rail traffic is suspended in France between French-retained and German-occupied territories.
- July 30 – The Pennsylvania Railroad orders its first 4-4-4-4 T1 duplex-drive steam locomotives. They are expected to be serious competition for diesel power.
August events
- August 1 – Norwegian State Railways runs first through train on the Flåm Line.
September events
- September 2 – Kansas City Southern Railway inaugurates the Southern Belle passenger train service between Kansas City, Missouri, and New Orleans, Louisiana.
- September 13 – The Gulf, Mobile and Ohio Railroad is formed by the merger of the Gulf, Mobile and Northern and Mobile and Ohio Railroads.
October events
- October 1 – The Pennsylvania Turnpike opens, constructed using tunnels and grades originally built for the never-completed South Pennsylvania Railroad.
November events
- November 4 – Norton Fitzwarren, England: a train driver on the Great Western Railway misreads the signals on a four track line, and drives his train off the end of the track.
- November 11
- The Østfold Line in Norway takes electric traction into use between Sarpsborg and Halden.
December
- December 15 – The IND Sixth Avenue Line of the New York City Subway is completed and opened throughout.
- December 17 – The Florida East Coast Railway introduces the Dixie Flagler passenger train between Chicago, Illinois and Miami, Florida, replacing the Henry M. Flagler.
Deaths
September deaths
- September 23 – Hale Holden, president of Chicago, Burlington and Quincy Railroad 1914–1918 and 1920–1929, chairman of the board of directors for Southern Pacific Railroad 1932–1939, dies (b. 1869).
October deaths
- October 24 – William Benson Storey, president of Atchison, Topeka and Santa Fe Railway 1920–1933 (born 1857).
November deaths
- November 9 – Charles Langbridge Morgan, chief engineer for London, Brighton and South Coast Railway, dies (b. 1855).
Unknown date deaths
- Leonor F. Loree, president of Baltimore and Ohio Railroad 1901–1903, Delaware and Hudson Railway 1907–1938 and Kansas City Southern Railway 1918–1920 (born 1858).
