ˈiːvən ðˌoʊ ðə fˈɪzɪks ʌv sˈʌtʃ tɹˈæk dɪzˈaɪnz wɜːɹ ɪntˈuːᵻtˌɪvli ˈɑːbviəs, ɪt wʌz nˌɑːt ʌntˈɪl kənstɹˈʌkʃən ʌvðə bˈɛvɚli hˈɪlz tɹˈæk ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪntiːn ðæt bˈɪldɚz bɪɡˈæn tʊ ɪŋkˈoːɹpɚɹˌeɪt ˌɛndʒɪnˈɪɹɪŋ nˈɑːlɪdʒ ðæt hɐdbɪn nˈoʊn tə ɹˈeɪlɹoʊdz fɔːɹ dˈɛkeɪdz.
Even though the physics of such track designs were intuitively obvious, it was not until construction of the Beverly Hills track in 1919 that builders began to incorporate engineering knowledge that had been known to railroads for decades.