wˈʌn ʌvðə tˈuː tɹˈeɪnz wʌz tɹˈævəlɪŋ ˌɔːɾəmˈæɾɪkli, ˈɑːpɚɹˌeɪɾɪŋ wɪðˌaʊt ɐ dɹˈaɪvɚ, wˌaɪl ðɪ ˈʌðɚ wʌz ˌʌndɚ mˈænjuːəl kəntɹˈoʊl.
One of the two trains was travelling automatically, operating without a driver, while the other was under manual control.