dˈʊɹɹɪŋ ðə nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi z, ðə sˈɪɾi dᵻsˈaɪdᵻd tə kənˈɛkt ðə fˈoːɹ səbˈɜːbən lˈaɪnz wˈɛst ʌvðə sˈɪɾi sˈɛntɚ wɪððɪ ˈɑːsloʊ mˈɛtɹoʊ.
During the 1980s, the city decided to connect the four suburban lines west of the city center with the Oslo Metro.