The Mikun - Ertom - Koslan section is part of the Mikun - Arkhangelsk railway line. The road was necessary for the development of huge forests and the development of the timber processing and pulp and paper industries in the Arkhangelsk region and the Komi Republic.
Until 1965, on the Mikun - Koslan line, surveys and design of timber railways were carried out according to lightweight standards. Later, Lengiprotrans proposed to build a line as an integral part of the country's railway network along the general direction Mikun - Arkhangelsk. At the same time, it solved the problem of timber transportation. The proposal was approved, and three lines were included in the subsequent work plan: Mikun - Ertom with a branch to Koslan, Ertom - Karpogory and Karpogory - Arkhangelsk.
Since the construction of the Mikun - Ertom - Koslan section was already underway, in the same 1965 the line was urgently redesigned according to the norms of the Ministry of Railways as a category III road and approved.
In 1974 the Mikun - Koslan line was put into permanent operation.
