A German soldier stands by while a 38cm “Siegfried” railway gun is fired at Sevastopol, 1941

Feb 4 1918 A 12 inch howitzer mounted on a railway carriage near Arras

IWM Q 8466

IWM Q 8464

IWM Q 8465

Bisbee Daily Review. December 3 1916

“A new type of British heavy gun, on a specially constructed railway carrages in action on the Somme front. It is with guns of this sort that Britain hopes to blast her way into Germany.” 

BL 12-inch railway gun