X10 is a series of two-car electric multiple units which was formerly operated by Greater Stockholm Transport (SL) on the Stockholm commuter rail between 1983 and 2017, when the City Line project made them imcompatible with the X60 train sets.

They were refurbished with new interiors and repainted between 1998 and 2002 Two other variants are X12 and X14 which can reach a top speed of 160 km/h.

During the early 1990s, the Norwegian State Railways borrowed X10 units during the summer to operate on the Flåm Line.

Only 9 of them were sold (4 to TÅGAB, 4 to Saga Rail and 1 to Transitio mainly as a source for spare parts), because their age and the lack of toilets made them unattractive on other routes.

The 8 remaining units owned by TÅGAB and Saga Rail received another minor refurbishment, including exterior repainting and the installation of on-board toilets, and since early-2018 are used on the routes Gothenburg–Falun and Stockholm–Linköping.