http://lrt.daxack.ca/LRTvsHRT/CostCompare.html
A pro LRT groups list of capital costs for LRT. Looking at it it would seem that building 200km of LRT would be between $4billion and $10 billion, or about 1/5th to 1/2 of the cost of skytrain. Unfortunately all these examples are mostly built along existing rights of way through suburbs, along highways and rail lines. This means that you would have to assume that the more accurate construction cost for Broadway would be the TTC example of about 43million per km, or about 1/2 of what skytrain costs. However keep in mind that the TTC's proposal for their cross town line(just like Broadway) involved some tunneling and came up to 74million per km.
So again obviously that guys costs are way of, there isnt a single example in NA that isnt atleast double, and thats ignoring where the lines are built. To build LRT lines in the city of Vancouver and through its built for would likely be a minimum of 40-50million per km, and thats being generous. And the limited capacity and travel speed would remain unless you seriously overbuild the system and that likely means your talking about over 100mill per km going through the Broadway corridor, and the system still wont be as efficient as skytrain, though it would be close.
By the way anyone can use the info i post or my posts for the cause, you all can add on to them, change, them, i dont give a shit so long as people dont twist the main point of them, im not a believer in intellectual property rights. So long as someone isnt making a profit of my posts than I could care less, in the case someone does make a profit, or gets recognition, I would like to atleast know what I did wrong to miss the opportunity.