It's clearly temporary to accommodate the overpass construction...
You can see the slidings (new third track) in the renderings, which the trains will return to once it's completed. They currently already wait just a few M to the east of Douglas road to enter the Thornton tunnel. This would be not be different to what currently exists.
Quote:
A new third track will be built parallel to existing lines in the Holdom area to allow for trains to pass or queue and allow for more trains to pass through Burnaby, according to the staff report.
“This will mean more frequent noise and emissions in the area,” the report notes. “However, these impacts would still be less than if those same goods passed through the city by truck.”
The construction of the overpass will also require trains waiting to enter the Thornton Tunnel – which runs 3.4 kilometres under Burnaby from the Second Narrows Bridge to the BNSF track – to move westward towards Willingdon. <----This is temporary
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You rather have them several kms away to Burnaby Lake/Winston? This screws timing, which affects all companies involved with these extremely busy BNSF tracks (CN, Amtrak, CP, VIA, Rocky Mountaineer)
You aren't going to get the noise of shunting here (think the noise by New West Quayside), they will not be assembling the trains here via rearrangements of train cars.
The construction of the overpass will also reduce noise from the train horn blasting when it passes the Douglas Rd crossing (LOUD), which seeing as to how you're in Milano, actually is good for you.