daɪvˈɜːdʒɪŋ æt dˈʌlwɪtʃ hˈɪl, ɪt hˈɛdᵻd nˈɔːɹθ bᵻnˌiːθ ðə mˈeɪn səbˈɜːbən lˈaɪn æt lˈuːɪʃˌæm tə lˈɪlɪfˌiːld bᵻfˌoːɹ hˈɛdɪŋ ˈiːst tə ɹoʊzˈɛl ænd pˈɪəmˌɔnt, ænd ðˈɛn sˈaʊθ ˌʌndɚ ɹˈeɪlweɪ skwˈɛɹ θɹuː ˌɛnˌɛsdˈʌbəljˌuːz ˈoʊldɪst tˈʌnəl tə dʒˈɔɪn ðə mˈeɪn səbˈɜːbən lˈaɪn aʊtsˈaɪd sˈɛntɹəl.
Diverging at Dulwich Hill, it headed north beneath the Main Suburban line at Lewisham to Lilyfield before heading east to Rozelle and Pyrmont, and then south under Railway Square through NSW's oldest tunnel to join the Main Suburban line outside Central.