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During winter NSB had large costs keeping the line snow-free. Large diesel-electric snowploughs were stationed at [[Finse]], and tens of kilometers of [[snow shed]]s were built on the most vulnerable parts. Especially the {{convert|22|km|mi}} part between [[Finse Station]] and [[Hallingskeid Station|Hallingskeid]] was a drain on resources, and heavy snowfall and drifts regularly closed the entire line. A solution was proposed by NSB's director [[Robert Nordén]] in 1984, involving construction of a {{convert|10.5|km|mi}} tunnel between the two stations.<ref name="dland2">Rødland, 1999: 15–34</ref> In the tunnel there had to be a {{convert|900|m|ft}} long [[passing loop]], to ensure even distances between passing loops along the line.
In 1989 the [[Parliament of Norway]] approved the plans, including the upgrade of part of the line east of Finse. In total NOK 750 million was invested in rebuilding {{convert|32|km|mi}} of line, shortening it by {{convert|4.5|km|mi}}. At the same time the permitted speed could be increased from {{convert|70|km/h|mph}} to {{convert|160|km/h|mph}}. The tunnel opened on 16 June 1992 while the rest of the upgrades opened in five steps between 1995 and 1998. The highest point on the line, previously at {{convert|1301|m|ft}}, became {{convert|1237|m|ft}}—located inside the tunnel.<ref name="dland2"/> After the tunnel opened, the Finse snow removal facility was closed.<ref>{{cite web |url=http://www.jernbaneverket.no/jernbanenettet/stasjonssok/stasjonsoversikt/article.jhtml?articleID=1488729 |archive-url=https://archive.today/20070929083329/http://www.jernbaneverket.no/jernbanenettet/stasjonssok/stasjonsoversikt/article.jhtml?articleID=1488729 |url-status=dead |archive-date=2007-09-29 |author=Jernbaneverket |title=Finse stasjon |access-date=2008-05-28 |language=no|author-link= Norwegian National Rail Administration}}</ref>
=== Hallingskeid Station and snow tunnels ===
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