The 17 cm SK L/40 i.R.L. auf Eisenbahnwagen "Samuel" (SK - Schnelladekanone (quick-loading cannon), L/40 - Länge (40 caliber barrel), i.R.L. - in Räder-Lafette (on wheeled carriage) auf Eisenbahnwagen (on railroad car)) was a German railroad gun used in World War I.