One of the biggest issues is that the 4.6B estimate was for a fully at-grade LRT system.
The City of Calgary presented their ludicrously biased community engagement regarding whether we wanted at-grade, elevated or tunneled without presenting the trade-offs (pretty standard for City of Calgary - only present trade-offs if they want the consultation to fail - like for the crosswalk at the Peace bridge).
One of the trade-offs of selecting the most expensive method (albeit the best from a technical perspective) is that you would run out of money for the full line. Pretty sure this was already a certainty once the decision to tunnel was made.
I would've been interested to see the consultation results if it was presented that if we do at-grade, we can complete the entire Green Line as planned, but the tunneled would lead to this staged approach we're seeing today.
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