How deep will the tunnel be under the rail yards? Probably deeper than the underpasses along the Yellowhead. Not to mention the related drainage infrastructure. I'm guessing that towers will be built on both sides of the Walker Yards. It's about 350 metres between towers, 120 metres less...
I was driving along the Valley Line West Route today. Not a lot of action, but some utilities at SPR at 151-156 Street and 156 Street at some sections. Other sections were covered for concrete work.
At least with the Valley Line and Capital Line South done by 2030, the bridges are largely complete (e.g., Henday crossings and Blackmud Creek). Most of the future LRT will be ground level.