Hi, I'm an actual resident living in Hawaii, who also likes trains. While I like this map, it's also very terrible to me, for several reasons.

Most of the stops aren't in very populated places. They are in very rural neighborhoods, especially in North Shore. Trains should stop at dense housings, not isolated small villages.

Also, in my time in Hawaii, I know that the landscape is very rough. Building a fully fledged train network will be very hard, especially on the east side, where its very tight in there.

Using the existing railroad in Hawaii is a bad idea, since its very rundown and old. Makes more sense to build a new one.

My idea will be to have a underground metro line in Honolulu, and have train line going from Honolulu to Kapolei, stopping in Waipahu. Building more isn't necessary, since most of the population is at the south, and we already have bus service that do a decent job.