The X3 is an electric multiple unit train used by Arlanda Express on the airport rail link service between Stockholm Central Station and Stockholm Arlanda Airport in Sweden. Alstom built seven of these four-train car units at its Washwood Heath plant in England in 1998/99.^[1][2] The X3 is part of the Alstom Coradia family, and can reach speeds up to 200 km/h.

You can help expand this article with text translated from the corresponding article in Swedish. (June 2022) Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Swedish Wikipedia article at [[:sv:Alstom Coradia X3]]; see its history for attribution. You may also add the template {{Translated|sv|Alstom Coradia X3}} to the talk page. For more guidance, see Wikipedia:Translation.

Quick Facts Manufacturer, Built at ...

X3
An X3 at Stockholm Central Station in November 2011
Manufacturer	Alstom
Built at	Washwood Heath, England
Family name	Alstom Coradia
Constructed	1998–1999
Entered service	1999
Number built	7
Fleet numbers	1–7
Operators	Arlanda Express
Specifications
Maximum speed	200 km/h (125 mph)
Weight	187 t (184 long tons; 206 short tons)
Power output	2,240 kW (3,000 hp)
Electric system(s)	15 kV 16+2⁄3 Hz AC catenary
Current collector(s)	Pantograph
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

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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.