Today, the route of an Express bus going thru the Zipper which ends at the airport is via Nimitz Highway.
In the morning the Express bus takes a contra-flow lane on the Nimitz.
Stopping the rail project at the Airport and continuing by bus via Nimitz 8 years from now would be an ideal way to remedy the funding situation.
-
So that commuters dropped off at the Airport Station gets to Alamoana free or almost free of traffic congestion in 2025,  the City Department of Transportation Services should activate their testing of Smart Traffic Signal Light System this year.  
Maybe use Nimitz Highway as a pilot project to test the system.
So that if successful, it would make sense to cut the rail route at the Airport Station
 For with NImitz Highway controlled and managed by an Adaptive Traffic Signal System commuters taking the train and bus to Alamoana could actually enjoy travel either free or almost free of traffic congestion.