DescriptionCanon de 120 mm L modèle 1878 sur affût-truck Peigné-Canet mle 1897.jpg
English: A French 120 mm gun mounted on an adjustable gauge rail carriage.
Date
Source
Railway Artillery: A Report on the Characteristics, Scope of Utility, Etc., of Railway Artillery, Volume II, page 1-7 by Harry W Miller, United States Army Ordnance Department. Washington, Government Print Office, 1921. Downloaded from
http://www.eugeneleeslover.com/ENGINEERING/Railway_artillery2.pdf