ɪt wʌz ˈɔːlsoʊ ɛkstˈɛndᵻd nɔːɹθwˈɛstwɚd ˌɪntʊ pˌɛnsɪlvˈeɪniə ɪnðə mˈɪd nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi z, ɪfˈɛktɪvli mˌeɪkɪŋ ˌɛnwˈaɪ fˈoːɹhˈʌndɹɪd twˈɛnti sˈɪks ðə mˈɪsɪŋ sˈɛɡmənt əvən ˈʌðɚwˌaɪz dɪskəntˈɪnjuːəs pˌiːˈeɪ fˈoːɹhˈʌndɹɪd twˈɛnti sˈɪks.
It was also extended northwestward into Pennsylvania in the mid-1940s, effectively making NY 426 the missing segment of an otherwise discontinuous PA 426.