https://en.wikipedia.org/wiki/Skyline_(Honolulu) Only 4 car trains? At least it's not a 2 - 2.5 car joke of a train that is the Canada embarrassment Line in backwards Vancouver.
Fortunately, it's a walkthrough train and with SDO, it could eventually become a 6 car train, if there is ever a need to increase capacity by 50%.
https://honolulutransit.org/about/route-map , https://www.youtube.com/watch?v=2Wq3THzQZr0
https://en.wikipedia.org/wiki/Skyline_(Honolulu)#Rolling_stock
https://www.honolulu.gov/dts/skyline/home/
Hawaii's $10BN Railway Nightmare Explained https://www.youtube.com/watch?v=3xnrhm1KcB4
https://jfdatalinks.blogspot.com/search?q=Selective+Door+Operation
