
Again when the M-Line is extended down Broadway they should build a third platform at Columbia at the same time.
Because with the Evergreen Line and the Broadway extension the most logic scenario is this:
Expo Line - Waterfront to King George - 100%
Evergreen Line - UBC to Douglas
Millennium Line - UBC to Columbia
Here, the Evergreen and Millennium Line trains would alternate (maybe 1 and 1 or 2 and 1, with 2 going to Coquitlam).