 The differences between Class 71 and 73 is that the latter has a different interior , four instead of three cars , different door design , the removal of one set of doors per car and the addition of tilting . At the time of ordering , it was announced that the trains would enter service on the Sørland Line during the summer of 1999 , the Dovre Line during the fall of 1999 , and the Bergen Line during the fall of 2000 . Class 71 was delivered in 1997 and 1998 ; one of the units was delivered with tilting technology to test it out — and subsequently removed . The first batch of trains cost NOK 1 @.@ 6 billion . 
