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The trains are painted white with yellow ends with a Scandinavian designed interior. The units use standard gauge tracks and are fed electricity at 15 kV 16.7 Hz AC like the rest of the Swedish railway network, but the trains use separate stations at Arlanda and dedicated tracks at Stockholm Central; in both cases, the platforms are higher than at other stations in Sweden, allowing step-free access to the trains without the use of low floors.
In 2025, an order for seven six-carriage Stadler Flirts was placed to replace the X3 fleet.[3]
