As the name suggests, the Arlanda Express is a train service operated by A-Train linking the busy Arlanda Airport and the City of Stockholm, the second largest Nordic city, a metropolis of 2 million residents. The service runs between Stockholm Central Station and the 3 Arlanda Airport stations over the Arlanda Line every 10 minutes using the X3 Coradia electric multiple units built by Alstom in Birmingham, UK in the late 1990s.
The Arlanda Line branches off from the East Coast Line, the mainline railroad linking Stockholm with cities to the North, including Sweden’s 4th largest city, Uppsala, home to over 200,000 people. Other than the Arlanda Express, the line also serves intercity trains to destinations along the East Coast Line with stops at the airport. The East Coast Line and Arlanda Line have a permissible maximum operating speed of 124 mph with the exception of some trains at 127 mph (i.e. SJ's X2). Below is a short film showing some of the traffic on the Arlanda Line (X3, X60, and X2).
The Arlanda Express X3 consists of 4 cars. Two of which are powered at a total output of 3,000 horsepower. The top speed of the Arlanda Express, among most other trains on the Arlanda Line and East Coast Line, is 124 mph.