Earlier this year I put in an OIA to KiwiRail asking some questions regarding the Auckland Rail Network, however, due to the abundance of transport news I have not been able to post about it.
One of the items that came back to me was preliminary designs for what a Westfield Flying Junction would look like as KiwiRail needed to do one so the NZTA could make sure that any East-West Link design did not preclude its possible future construction. For those unfamiliar with the terminology, a flying junction is a grade-separated junction allowing faster/more efficient movement of trains as they do not need to wait for the opposing train to clear before they can cross.
The design looks seriously smart not only separating the conflicting movements between the Eastern and Southern Lines but also allowing easy freight access to/from both Metroport and Westfield yards. It looks as if the Southern Line is elevated over the top using an embankment and small overbridge while the Eastern Line Citybound track skirts around and sneaks under. The design is also really smart as the third main does the same allowing freight trains heading on the Eastern Line to do so without crossing the Southern at grade.
It also looks like it connects well with the future 4th main and proposed interim 3rd track towards Sylvia Park to give stacking capacity which could be turned into a third main to the Port (A third main to the Port is in Upper North Island Freight Story as well as the last Integrated Transport Programme but not in the more recent ATAP as KiwiRail did not consider full triple tracking was necessary within the timeframe)
All in all looks like a really great design what do you think?