It’s not intuitive because this section of track initially called for elevated rail and that idea was scrapped because, and I’m paraphrasing here, “elevated track has a tendency of dividing communities and isn’t inviting”. They also said traffic would only experience minor interruptions with the use of “creative signalling”.
It’s kind of frustrating how we can’t build things in this country anymore without being bogged down by red tape, inefficient and bloated partnerships, inexperience, and greed.