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