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.