Ådalen Line

The connection from Sollefteå and Långsele was built by the Swedish State Railways and opened in 1886, at the same time as the northern part of the Main Line Through Upper Norrland from Ragunda to Långsele.

The section from Härnösand to Sundsvall was originally built as part of the East Coast Line and opened in 1925, two years before the line was completed to Gävle.

The Härnösand–Sollefteå Railway was nationalized in 1932 and electrified in 1958 at 15 kV  16.7 Hz AC.

[1] The Swedish Transport Administration upgraded 100 kilometres (62 mi) of the line, and built 30 kilometres (19 mi) of new track, from Sundsvall to the connection with the new high-speed Bothnia Line north of Nyland.

This section has eight new tunnels, totaling 14 kilometres (8.7 mi).