X16 and X17 was a series of electric railcars operated by Statens Järnvägar (SJ) of Sweden. They were built by and ASEA in 1955-56 and delivered as 30 units. They are the electrical counterpart of Y6 and Y7 railcars. The units were mostly in service in Svealand, and later around Gävle and in Värmland in the 1980s. The X17 differed in having four-a-breast seating, instead of five.