standard The line is single track (with grading and other provisions for a second track), and has 22 passing loops. The maximum axle weight is 25 tonnes at (freight trains) and permitted for passenger trains. Curves have a radius of or more, except for the passage of Örnsköldsvik (down to and a few between . The maximum grade is 1%. Delayed stretch through the natural reservation area The middle part of the railway was ready for traffic in 2008, and all of the railway except the northern part from October 2009. The northern part, near Umeå, did not see operation until August 2010, due to a court battle over the placement of a bridge that crosses over environmentally sensitive areas at the Ume River. These areas are protected as a nature reserve and the process to approve its location was opposed by environmentalists and neighbours concerned about their properties. Other alternatives to the present location were deemed unacceptably close to the Umeå Airport for safety reasons, and a tunnel under the airport and river would have been much too expensive. A more southerly route would have lengthened the line and been more expensive. The crux of this debate was that the nature reserve was established some years after the railway line placement had been fixed. There was no passenger traffic before all of the railway was finished, because the largest city, Umeå, was not connected to this line before then, though some freight traffic used the finished sections. Times, distances and average speed The railway line itself allows . The trains will run at for the first several years, with a speed increase in the future, as of 2021 scheduled for around 2025 when SJ gets new trains. The Transitio leasing company owned by the counties signed a contract in October 2008 to buy Alstom Coradia trains. These trains were delivered in 2011, and they have a top speed of . For long-distance trains from Stockholm, SJ runs X55 trains, with a top speed of . So far the suppliers cannot guarantee winter characteristics above , since there is no experience operating at such speeds in the northern Swedish climate. Still 2021, no trains run here above since operator hasn't bought faster trains considering it's the only railway in Sweden allowing it above , and the fact that air travel is much faster Stockholm-Umeå anyway. The Bothnia Line was also