December – First deliveries of USATC S118 Class "MacArthur" 2-8-2 locomotives, to Nigeria. There will eventually be nearly 800 built to the same basic design, seeing service on every continent, on 3 ft 6 in (1,067 mm) or metre gauge.[3]
December 11 – USATC S160 Class2-8-0 #1604 (built by Alco) is officially handed over on loan to the British government at London Paddington station, from the first batch of 2120 for service in the European theater.[3]
December 27 – Almonte, Ontario, Canada: Thirty-six people are killed and over 200 injured when a passenger train running late is struck from behind by a troop train.[10]
^ abcdeTourret, R. (1977). United States Army Transportation Corps Locomotives. Allied Military Locomotives of the Second World War, Book 2. Abingdon: Tourret. ISBN0-905878-01-9.