John, that yellow 4-4-0 and the red ?? pulling the open passenger cars don't look like anything the OR&L nor the Navy operated on Oahu, are they operated by the museum?
There were quite a few Diesels operated by the OR&L prior to abandonment in 1947, the GE looks like one of them. There's a big article in Kalmbach's The Railroads In World War II, on the OR&L. There's one shot of a bunch of sailors headed for the beach packed into gondolas. That's better than the conductor, he's riding on the end beam of the last car, hanging on the the brake wheel for dear life!