Re: Does Hawaii have an operating vintage train. Yes, the one on Oahu. Meanwhile here is a source you can use.
Hawaii had several "real" rail systems only the museum rr on Oahu is left due to the USN use of the lines up through the sixties to an ammunition facility. The others were on the big Island, the standard gauged "Pennsy of the Pacific" destroyed in the 1946 tidal wave. And the train that operated out of Lahaina abandoned, and fire damaged, and maybe for sale, or maybe not depending on what week it is.
Links:
Lahaina RR status onf somethig called wikipedia
Hawaii Railroad Story-YouTube