baɪ ðɪ ˈɛnd ʌv nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi wˈʌn "ɐ nˈʌmbɚ" ʌv kɹˈuːd ˈɔɪl dˈiːzəl ˈɛndʒɪnz wɜːɹ ˈaʊt ˌɔn tˈɛst fˈɪɾᵻd tə hˈɛvi ɡˈʊdz vˈiəkəlz.
By the end of 1931 "a number" of crude oil (Diesel) engines were out on test fitted to heavy goods vehicles.