True, but if we built any other sort of infrastructure (water, sewage, electicity) that operated at above over 100% capacity from day one, wouldn't we consider a solution with more capacity?
With the light rail already blowing out as of November last year from $1.6bn to $2.1bn [1] I can't help but think of the merit of heavy rail.
My understanding is heavy rail is very expensive, but how much more? I haven't been able to find a comparison of a heavy rail design on this route.
[1]: http://www.theaustralian.com.au/news/nation/sydney-cbd-and-e...
One can't help but imagine how many more buses we would need without light rail, no?