1) To increase the capacity of Auckland’s rail network by turning Britomart into a through station and adding another rail entrance to the city centre from Mt Eden.
2) To ease the pressure on the city centre’s roading network by reducing the level of future increases in buses and cars.
3) To significantly reduce travel times on Auckland’s rail network – especially for trips from areas along the Western Line to the city centre.
4) To allow higher train frequencies to be operated on all lines of the Auckland rail network.
5) To provide sufficient capacity in the rail system for future extensions (rail to the airport, Avondale-Southdown line etc.) to be possible.
6) To stimulate business activity in the city centre and other rail served centres and generate agglomeration benefits.
7) To stimulate higher intensity residential development around the rail network and reduce the need for Auckland to grow via urban sprawl.
8 ) To enable a much more efficient and effective bus network.
9) To improve rail access in the city centre.
10) To allow trains to be routed through the city centre and offer one-seat rides between centres on different sides of Auckland.