The 28 cm K L/40 "Kurfürst" (K - Kanone (Cannon) L - Länge (with a 40 caliber barrel), Kurfürst (Elector) was a German railroad gun that served on the Western Front in 1918 during World War I. Originally a naval gun, it was adapted for land service when its original ships began to be disarmed beginning in 1915. All six built were destroyed postwar according to the terms of the Treaty of Versailles.