Millennium Line - Evergreen Extension | Completed

[officedweller]

Here's the pic posted by nname earlier in the old archived thread showing his proposed location for switches that could access a new Columbia platform to the north (under Clarkson Street)
(as opposed to the TransLink report (quoted below) which proposed a switch where the future Woodlands Station would be built - preventing the construction of a station there).

Building a third track at Columbia in the “back” of the Columbia inbound platform will allow the Lougheed shuttle to avoid sharing the track with the Expo main line trains.
A crossover for the shuttle would be needed outside Columbia station, likely in the vicinity of the unbuilt Woodlands Station (approximately 950 metres from Columbia).

This would also keep both tracks in the tunnel active and shorten the "single track" segment of the route.
An additional switch would lead to the platform siding under Clarkson St.