wˈʌn sˈɛkʃən ʌvðə nˈɔːɹðɚn ˈæɹoʊ wʌzɐ sˈiːzənəl sˈʌmɚɹˈoʊnli wˈiːkli sˈɜːvɪs bᵻtwˌiːn ʃᵻkˈɑːɡoʊ ænd mˈækɪnˌɔː sˈɪɾi.
One section of the Northern Arrow was a seasonal summer-only weekly service between Chicago and Mackinaw City.