The existing network is part of the problem. Options put forward include do nothing, new dedicated line from CBD to the airport, or branch off one of two existi

The existing network is part of the problem. Options put forward include do nothing, new dedicated line from CBD to the airport, or branch off one of two existing lines in the area for a new airport spur line. Then you have to think about, how often can you run airport trains on existing lines? Do they go express or stop at stations? If they stop at stations, does it take too long for airport passengers? None of them are hard questions, but in a partisan political environment where no parties can agree with each other, unless you can plan it in two years and build it in another 2, there's no way it's going to happen before next election.