Arlanda Express is a high-speed train that links Stockholm to Arlanda Airport.
Below is a video of Arlanda Express leaving Stockholm Central Station. Also in this video Rc6 locomotive no. 1419. Recorded on Nov 23, 2013 in Stockholm Central Station.
Bonus: SJ Regional to Goteborg, leaving Stockholm Central Station. Also in this video a SJ Regional with Rc6 locomotive no. 1417 and SL Metro.