The only major accident that occurred on the NSC network was the Cowden rail crash when, on 15 October 1994, the driver of a Class 205 failed to see a red signal (this was believed to have been caused by fog), and drove the unit on to a single track section of the Uckfield line, where it collided with a train travelling in the opposite direction.
ðɪ ˈoʊnli mˈeɪdʒɚɹ ˈæksɪdənt ðæt əkˈɜːd ɔnðɪ ˌɛnˌɛssˈiː nˈɛtwɜːk wʌzðə kˈaʊdən ɹˈeɪl kɹˈæʃ wˈɛn, ˌɔn fˈɪftiːn ɑːktˈoʊbɚ nˈaɪntiːnhˈʌndɹɪd nˈaɪnti fˈoːɹ, ðə dɹˈaɪvɚɹ əvə klˈæs tˈuːhˈʌndɹɪd fˈaɪv fˈeɪld tə sˈiː ɐ ɹˈɛd sˈɪɡnəl ðɪs wʌz bᵻlˈiːvd tə hɐvbɪn kˈɔːzd baɪ fˈɑːɡ, ænd dɹˈoʊv ðə jˈuːnɪt ˌɔn tʊ ɐ sˈɪŋɡəl tɹˈæk sˈɛkʃən ʌvðɪ ˈʌkfiːld lˈaɪn, wˌɛɹ ɪt kəlˈaɪdᵻd wɪð ɐ tɹˈeɪn tɹˈævəlɪŋ ɪnðɪ ˈɑːpəzˌɪt dᵻɹˈɛkʃən.