https://www.youtube.com/watch?v=FWeMvBEbok4
Seattle Train Extension is coming sooner than you think! Here’s why https://www.youtube.com/watch?v=-OjwvXr4QrQ
https://www.youtube.com/watch?v=ct4bwWsP3iE
Fortunately, like Edmonton, Seattle chose to have long underground stations. Of course backwards Vancouver would end up having shorter underground train stations than Seattle and Edmonton. Thus, that helps to keep Vancouver stuck with having shorter trains so that they can fill up faster and symbolically not look like long big city trains.