Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The Northern Main Line (Swedish: Norra stambanan) is a 268-kilometre (167 mi) long electrified railway in Sweden, between Gävle or Storvik and Ånge. The railway consists of single track except the parts between Mo grindar and Holmsveden, Kilafors and Bollnäs, and Ramsjö and Ovansjö, a total of 91 kilometres (57 mi) double track.
Northern Main Line, railway line in Sweden