March 19 - Baldwin Locomotive Works completes the last locomotive commercially manufactured for Maine narrow gauge railroads.[1]
March 31 - American Car and Foundry acquires Pacific Car and Foundry.
April
April 12 - Kyushu Railroad Line, as predecessor for Nishitetsu Tenjin Omuta Line, Fukuoka Tenjin to Kurume route officially completed in Fukuoka Prefecture, Kyushu Island, Japan.
July 31 - Uetsu Line, Niitsu of Niigata to Akita route officially completed in Japan, as same time, Osaka via Niitsu to Aomori route direct express train service start.[4]
August 14 - The New York Central tests a General Electric diesel-electric locomotive. The locomotive succeeds in starting a train of 93 cars on level track.
September
September 28 - The Chicago and Alton Railroad places "the handsomest train in the world" into Chicago – St. Louis service. The red painted, million dollar train competes with Illinois Central Railroad's green and black Daylight Special and Wabash's blue Blue Banner Special.
October
October 23 - Two trolley cars of the Hull Electric Railway in Ottawacollide head-on due to a misunderstanding in operations around track maintenance work.[7]
November 7 - Experimental three-truck diesel-electric locomotive Ys. N 002 (designed by Ya. M. Hakkel) makes first trial trip on the Oktyabrskaya Railway in the Soviet Union.[8]
Book: Jones, Robert C.. Two Feet to the Lakes. Pacific Fast Mail. 1993. 0-915713-26-8. 221.
Book: Ferneyhough, Frank. The History of Railways in Britain. Reading. Osprey. 1975. 0-85045-060-8.
Web site: Railroad History Timeline: 1920-1929. RRHX: Michigan's Internet Railroad History Museum. March 12, 2009. https://web.archive.org/web/20090227061650/http://michiganrailroads.com/RRHX/Timeline/1920s/TimeLine1920sBackUp.htm. 27 February 2009. dead.
[:ja:羽越本線#歴史#全通以降]
Web site: Williamsport Bureau of Transportation. 2005. History of Mass Transit in Williamsport. 7 August 2005. https://web.archive.org/web/20050808082738/http://www.citybus.org/history1.html. 2005-08-08. dead.
[:it:Stazione di Ostia Antica#Storia]
Web site: Head on at Deschenes. Colin Churcher's Railway Pages. October 23, 2006. https://web.archive.org/web/20060928025043/http://www.railways.incanada.net/Articles/Article2002_2.html. 2006-09-28. dead.
Web site: Test Diesel Locomotive Shch. Relics of Science & Technology Database. Polytechnical Museum. 2004. January 12, 2010.