klˈæmpənbˌoːɹɡbeɪnən wʌzɐ nˈætʃɚɹəl fˈɜːst tʃˈɔɪs wɛn ðə dᵻsˈɪʒən tʊ ᵻlˈɛktɹᵻfˌaɪ ðə lˈoʊkəl ɹˈeɪl tɹˈæfɪk ɚɹˈaʊnd kˌoʊpənhˈeɪɡən wʌz tˈeɪkən, ænd ðə fˈɜːst ˈɛstɹˈeɪnz ɹˈæn ɪn nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi fˈoːɹ.
Klampenborgbanen was a natural first choice when the decision to electrify the local rail traffic around Copenhagen was taken, and the first S-trains ran in 1934.