This restructuring divided the agency into six separate state-owned limited companies, including SJ for passenger trains, Green Cargo for freight, and Jernhusen for railway buildings.

SJ received a government bailout a few years after its creation, but has since had profit margins of up to ten percent.

The X2 trains (Operated by SJ as X 2000) launched in 1990, and are used for higher-speed services and have a top speed of 200 km/h (125 mph).

Built in Sweden by Kalmar Verkstad, later ADtranz, they feature tilting technology to reduce the effects of high-speed turns.

They have also previously served the Stockholm-Sundsvall, Stockholm-Strömstad, Stockholm-Oslo, and Stockholm-Östersund-(Duved) lines, with seasonal services on some of these routes.

[9] The X40 is a double-decker Coradia Duplex train built by Alstom used for regional services, launched in 2006.

It typically serves shorter routes, such as the Stockholm-Uppsala line (Uppsalapendeln), which is often composed of eight cars.

The contract, valued at SEK 7 billion (EUR 630 million), was awarded to Bombardier (now part of Alstom) by SJ in 2021.

[15][16][17] 25 CAF Civity Nordic, scheduled to enter service in 2027, will operate on regional routes including Stockholm-Västerås-Örebro-Skövde-Gothenburg, Linköping-Norrköping-Stockholm-Arlanda-Uppsala-Gävle-Ljusdal and Kalmar-Gothenburg.

[20] As of 2022 SJ has in collaboration with DSB and RDC begun to operate night train services between Sweden and Germany through Denmark.

Within Sweden are SJ Rc locomotives used, and in Denmark are DSB EA used, and in Germany are DB 101 used.

SJ AB also started operating the Öresundståg franchise for the 2020 timetable, taking over from Transdev.

The initial contract for the Mälartåg franchise states that the operator may use their own fleet [of X12, X40 and X50 stock] until the delivery of ER1 Stadler Dosto 200 EMUs is completed.

[24] and Umeå Central Stops at Arlanda and Uppsala are for boarding northbound or alighting southbound respectively, although passengers with railcards are exempted from this rule.

[31] Additionally, since September 2009, passengers are required to carry an identity document while traveling on SJ trains.