Anyone who has observed the past several years would know that this additional tax will not be enough. This project has been a classic slow-roll of endless cost increases, with many that could/should have been expected. It may already be too late to pull the plug but spending another few $B will surely reach that point of no return. IMO, a rail system will only work if additional lines are added to make it truly convenient and an alternative to driving. That would require spending probably another $50B+ and I don't know where that kind of money would come from.  If it ends up being a single line from Kapolei to Ala Moana it does nothing other than become a monument to government waste and probably a tourist/recreational ride.