Kind of aside the main discussion, but the Canada line was approved at 1.35 billion, cost 1.9 billion, and had it's scope significantly reduced in order to manage that. It being a p3 allowed hiding 'competitive' information such as cheaper but disruptive construction and single track sections from the public, and the cities involved until after it was approved. I like having new mass transit, but I'm not sure this can be used as an argument for the economic benefits of the olympics. Though it could be an argument that the olympics give political cover to push through large projects irrespective of the problems/benefits and that may or may not come out well.