ðə jˈuːnɪt wʌz bˈɪlt baɪ ðə pˈʊlmən kˈʌmpəni ɪn nˈaɪntiːnhˈʌndɹɪd twˈɛnti fˈoːɹ æz twˈɛlvsˈɛkʃən wˈʌndɹˈɔːɪŋ ɹˈuːm hˈɛviwˌeɪt slˈiːpɚ kəlˈoʊkwɪəli ˈeɪ “twˈɛlv dˈæʃ wˈʌn”.
The unit was built by the Pullman Company in 1924 as 12-section 1-drawing room heavyweight sleeper (colloquially a “12-1”).