BL 9.2 inch British naval and coastal defence gun, a variation of which was adapted to fit railway truck mountings to provide mobile long-range heavy artillery for the Western Front.
Description: Black and white photograph of a British BL 9.2-inch railway gun in action in France
Date: c. 1917-1918
Source: Wikimedia Commons http://en.wikipedia.org/wiki/BL_9.2-inch_Railway_Gun#mediaviewer/File:BL9.2inchRailwayGunMkXIIICamouflagedInAction.jpg
Identifier: N/A