Slap a roof on in and make it an elevated bike highway. Lower construction costs. Way lower maintenance. Better environmental, health, and strees impacts. It's only a 12 mile system...that's less than a half hour bike ride. Plus don't need to worry about what to do at the end of the line. Don't need to worry about parking issues at the stations. Hawaii is not the continental US, and needs to stop trying to copy what is a broken model for developing metropolis. Every major city dumps tons of money to keep its rails systems afloat. Is that the route we want to go?  Or something more progressive?