X10 is a series of two-car electric multiple units operated by Greater Stockholm Transport (SL) on the Stockholm commuter rail. The X10 was operated in sets of up to five units, making ten-car trains, each unit consisting of one motor car and one unpowered car. They are completely compatible with the X1 introduced in the 1960s. 101 units were built by ASEA between 1983 and 1993.
During the early 1990s, the Norwegian State Railways borrowed X10 units during the summer to operate on the Flåm Line. This was in part because the wanted to use the X10's larger windows for the tourist route.