I never really thought that light rail would replace buses completely.
One can't help but imagine how many more buses we would need without light rail, no?
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...
http://www.smh.com.au/nsw/sydney-cbd-and-south-east-light-ra...