As a further development of the X1, the X10 was manufactured by ASEA (later ABB) from 1983. On the whole, the vehicles hardly differed, so they also had side walls made of corrugated steel, each with three double doors. However, the front end was slightly tapered and with slightly increased power and a dynamic brake, the top speed was set at 140 km/h. Nevertheless, multiple operation with the X1 was still possible. The bad experiences with the X1 in winter were taken into account and, for example, the air intakes were placed higher to keep them free of snow. Of the 101 X10s, 52 ran in the Stockholm area and the rest in the Uppsala area.
Between 1991 and 1994, 18 trains were built under the designation X12, which should be used in regional traffic. In addition, they had only two doors per side, four instead of five seats per row, toilets and a first-class compartment. The speed had been increased to 160 km/h. The vehicles of the X14 series are similar, of which 18 were also built between 1994 and 1995. The biggest difference to the X12 was that there were five seats per row again. Later two X12 were converted to X14. Between 1994 and 1998, 49 X10 trains were also converted to regional trains, but without an increase in maximum speed. Most of the X11s were used in southern Sweden at Pågatåg. Like the X1, some of these series were replaced by the X60 from 2016, others by Stadler KISS double-decker trains from 2019.
