Terrific read it is too! Particular fan here of cheaper options (and greater frequency) on the Tranzalpine and Coastal Explorer. Well, and the Southerner!
You could do the above for less than the RoNS north of Warkworth. I have a more ambitious wishlist—see last chapter of Can't Get There from Here—but this is where we should be *starting*: it rightly ought to be seen as basic for functional transport, not pie in the sky or subject to partisan whim