Best option, end rail at middle street.  Turn it into a dedicated roadway.  One way into town midnight to noon.  Westbound one way noon to midnight.  Don't buy rail cars.  Don't sweat the HECO bill.  

Next best option, raise hotel tax enough to fund rail and hire needed DLNR staff and water safety guards to manage trails, beaches and camping.   Oahu is over its capacity to provide visitors with a quality vacation.  Trails are overcrowded and not maintained.  Many beaches are in poor condition and overcrowded.