 Tickets on the Signatur service cost NOK 25 more than with conventional trains , which would continue to run . Tickets were also made available via Amadeus , a ticket reservation system in Norway previously only used for airlines . Prices became differentiated , with prices between Oslo and Kristiansand varying between NOK 250 and 780 , depending on time of travel and class . NSB stated that they hoped to compete with airlines between the two cities , as travel time from city center to center was about the same as by plane . 
