Construction began on 20 January 1908 and was led by J. T. Mæhre. There were similar good building conditions, allowing for rapid construction. The line's only tunnel was built, as were six bridges. The two longest were built to cross Glomma. With a span of , Haugsfoss Bridge was the longest in the country at the time and work was subcontracted to a German company. Five stations were built. Construction cost NOK 2,869,750, giving the lowest kilometer price of any mainline railway ever built in Norway. The segment was officially opened on 3 December 1910 and regular traffic commenced the following day. Work on a new station in Elverum did not commence until 1910, and the new station was opened on 1 May 1913. As the Rorøs Line was narrow gauge, Elverum Station featured break-of-gauge and a transshipment facility until 1919.