Must be me, but I think if they are going through all this trouble, they should've gone to 5 car-minimum stations already. You just know that pretty soon that they will reach capacity with 4 as well and it would've been smart to be a bit ahead of the game (although I know that's not Calgary's style when it comes to infrastructure!).
It's not like 5 is that crazy, quite a few subway networks out there are around 10.
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