 The first of the B @-@ series trains were delivered for trial runs on 7 March 2001 . In May , NSB stated that they would never be able to operate the trains with the speeds they had previously stated they could , and that at least for the next year , the tilting trains would operate at the same speeds as conventional trains . On 17 September 2001 , the trains were put into service on the Bergen Line between Oslo and Bergen . During the following winter , the trains had problems running through snowdrift unless they were running at a sufficiently high speed . Because part of the Bergen Line had frost heave , trains were forced to drive extra slowly , causing trains to get stuck . NSB stated that tests had shown that Class 73 was better able to do this than El 16 , which had previously been the main locomotive on the line , although Class 73 did not do as well as the modern El 18 . In January 2002 , NSB started rebuilding the A @-@ series trains with a larger baggage compartment . This was largely because of insufficient space for passengers to take skis with them . 
