Passengers from Oslo to Arendal must change trains at Nelaug.

[1][2] Since 1910, Nelaug was a stop for the (originally narrow gauged) Treungen Line that was opened to Åmli.

At the same time the southern part of the Treungen Line was converted to standard gauge.

Also at that time, a new station building was completed at Nelaug by the architects Bjarne Friis Baastad and Gudmund Hoel.

The entire community of Nelaug, including store and school, is built up around the train station.