A better solution than building rail would have been to make Kapolei a true second city by building upwards instead of outwards.  You could easily build 5-6 First Hawaiian Center sized buildings in Kapolei for $2 Billion and have the City/State move some of their offices out of downtown along with some private companies by giving them tax credits to relocate which would make thousands of people drive eithe in the opposite direction of the current traffic flow or never have to leave Kapolei at all because they live there.  That would make more of a permanent dent in traffic than rail ever will and it would still be 80% cheaper than the latest cost estimate for a project that no one knows to this day how much it's ultimately going to cost.