The cost to do this separation is close to $500 million, but will be paid back in full in a matter of years as more trains are added to all lines.
ðə kˈɔst tə dˈuː ðɪs sˌɛpɚɹˈeɪʃən ɪz klˈoʊs tə dˈɑːlɚ fˈaɪvhˈʌndɹɪd mˈɪliən, bˌʌt wɪl biː pˈeɪd bˈæk ɪn fˈʊl ɪn ɐ mˈæɾɚɹ ʌv jˈɪɹz æz mˈoːɹ tɹˈeɪnz ɑːɹ ˈædᵻd tʊ ˈɔːl lˈaɪnz.