"It's more like 8.2 billion and not 15 billion"

emmm no, not even the massively pro (D)onkey SA dares to state only $8-billion! LOL 
The SA itself reported an estimation of $12-billion from HART and the feds are estimating closer to $14-billion. But no one is saying a word about costs for the necessary power plant to power the choo-choo so the real numbers might be closer to $15-billion to have it 100% complete which would include the new power plant required to power the choo-choo. 

Do a search on the SA, you'll see all the articles yourself if you don't believe my summary!