Te Upoko o te Ika a Māui / Wellington

Has anyone come across a more detailed plan or spec for this?

I remember hearing something about it, maybe a year ago. I can sort of see the route where it would presumably follow, maybe close to SH2 on the south side until the existing line comes in to Manor Park(?).

At a glance I can't really see how it's possible without, at the very least, plouging through a bunch of existing houses in the vicinity of Owen Street, and maybe also building the line in some flood-prone areas (which may be fine if it can be done to survive the flooding). Especially if it's double tracked, as the article suggests it might be. This might be the plan but it'd be helpful to have a clearer understanding of what's at stake.

That would be awesome! Melling line is very slow, and not convenient at the moment.

Not only did there used to be a track there as the article mentions, this route was in fact the original Wairarapa line, before what was called the Silverstream diversion. For a time both routes were kept. Its a crime that the original line was removed, its a shame that no one had the foresight to at very least maintain the corridor for the future.