The projected costs of the railway line were NOK 4.3 billion ±20%. Total costs ended at NOK 7.7 billion, including 1.3 billion extra used on extraordinary expenditures on the Romeriksporten. On 1 October 1996 it was decided that the construction company, NSB Gardermobanen, would also become the operator of the airport express train. However, due to limited profitability with the company, from 1 January 2001 the ownership of Gardermobanen was transferred to the Norwegian National Rail Administration, who also owns the rest of railway lines in Norway. The operating company changed its name to Flytoget AS.