The 14"/50 caliber railway guns were spare US Navy Mk 4 14 inch/50 caliber guns mounted on railway cars and operated by US Navy crews in France in the closing months of World War I.
Firing from Thierville-sur-Meuse, NW of Verdun
Mk I gun car of the type that served in France
Mk I gun car with pit prepared, ready for firing
Mk II mount
14-inch M1920 railway gun
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The 14-inch M1920 railway gun was the last model railway gun to be deployed by the United States Army. It was an upgrade of the US Navy 14"/50 caliber railway gun. Only four were deployed; two in the
14-inch/50-caliber railway gun
…14"/50 caliber gun: gun description and US Navy service 14-inch M1920 railway gun—US successor List of railway artillery…
Diagram showing gun barrel in the elevated position.
A M1920 on the test range.
A group photo with a M1920.