 After the war trains faced competition from aviation and automobiles , and serving trolleys were installed on Norwegian trains . In 1965 cart service on trains was centralised and standardised ; food service was faster , and prices were lowered . During the 1970s cafeteria cars were used , where passengers could serve themselves . 
 After the war trains faced competition from aviation and automobiles , and serving trolleys <a href='uninflect' title='1'><mark>were</mark></a> installed on Norwegian trains . In 1965 cart service on trains was centralised and standardised ; food service was faster , and prices <a href='uninflect' title='2'><mark>were</mark></a> lowered . During the 1970s cafeteria cars <a href='uninflect' title='3'><mark>were</mark></a> used , where passengers could serve themselves . 
After the war trains faced competition from aviation and automobiles , and serving trolleys was installed on Norwegian trains . In 1965 cart service on trains was centralised and standardised ; food service was faster , and prices was lowered . During the 1970s cafeteria cars was used , where passengers could serve theyself .