X16 and X17 was a series of electric railcars operated by Statens Järnvägar (SJ) of Sweden. They were built by Svenska Järnvägsverkstäderna and ASEA in 1955-56 and delivered in 30 copies. The units 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 breadth seating, instead of five.