Railway director Carl Abraham Pihl, who was demanded in 1857 by a Royal Decree to instruct a terrain investigation of the area along the river Drammenselva from Drammen to Randsfjorden, proposed a rail line from Randsfjorden with a branch line to Hen, the construction of which began on 4 December 1863.
On 11 June 1857, railway director Carl Abraham Pihl was demanded by a Royal Decree to instruct a terrain investigation of the area along the river Drammenselva from Drammen to Randsfjorden. He presented the results of the investigation on 31 May 1858, which concluded that the terrain between Drammen and Randsfjorden was favorable for a rail line. Pihl thereupon proposed a rail line from Randsfjorden with a branch line to Hen. The construction of the Randsfjord Line was begun on 4 December 1863, and, on 1 September 1866, the line was finished to Vikersund. 
