 In April 1999 , NSB launched a new branding scheme for their trains . In addition to Puls for local trains and Agenda for regional trains , the Signatur ( " Signature " ) concept was introduced for intercity trains . Signatur would only be used on the Class 73 services , and consist of two classes , Comfort and Comfort Plus . NSB abolished its branding of only having red trains , and introduced a blue and silver livery on the Class 73 trains . The new service had fewer stops and faster travel times . To take advantage of the faster speeds , the Norwegian National Rail Administration needed to do upgrades to the track , overhead wires and signaling for NOK 1 @.@ 2 billion . 
