In 1924, there was a landslide at Høga, covering the area planned for the railway. The area was made of phyllite and was the geologically most unstable area on the route. The initial response was to plan for a tunnel past the area, but this was quickly rejected because of the high price. Instead, the line was moved further away from the mountain side. Other slides during construction included an avalanche near Store Reppa on 10 February 1925, which deposited up to of earth. In April 1925, a landslide took place above Berekvam. On 8 February 1928, an avalanche did some damage to the right-of-way near Nåli.