I think Annie covered it.
It's important to note, particularly in the case of large-scale transit infrastructure, that there are very few examples globally—a “count on one hand with a few fingers left over” number of examples—of self-sustaining projects that actually make money on their own without some kind of government subsidy.
What we do when we get involved in a project like that is that we ask what the best form of that subsidy would be. Can we structure it in a way that is transparent, that provides more accountability for taxpayers and that results, possibly, in a return of some of that money? This is sharing in the upside to the extent that it takes off, as opposed to writing a grant cheque and giving less thought to the upside scenarios and the structuring.
I'll leave it at that.