ðɪ ɚɹˈɪdʒɪnəl tˈuː lˈaɪnz dˈeɪt bˈæk tə ðə nˈaɪntiːnhˈʌndɹɪd sˈɪksti z, bˌʌt ɪn tˈuː θˈaʊzənd sˈɪks ðə pˈaɪplaɪn wʌz ɛkstˈɛndᵻd baɪ ˈædɪŋ ðə θˈɜːd lˈaɪn.
The original two lines date back to the 1960s, but in 2006 the pipeline was extended by adding the third line.