 In November 2006 , the city government proposed that the maintenance of the new trains be privatized . This resulted in protests from the employees , who campaigned by refusing to work overtime . As a result , after a few weeks , the company lacked 57 trains to provide adequate service . The issue was solved when the socialist opposition parties along with the Liberal Party agreed to postpone the matter until after all the new trains were delivered in 2009 . As part of the agreement , a new limited company , Oslo Vognselskap , wholly owned by Kollektivtransportproduksjon , would take ownership of all metro trains and trams used by the operating companies . Responsibility for the debt accumulated for buying the trains is to be managed by Oslo Vognselskap , while operation and management of the maintenance contracts was transferred to Oslo T @-@ banedrift . 
