Skyline opened with five days of free service through July 4, when daily ridership peaked at 18,108. The elevated train system with its unique views proved to be something of a tourist attraction during the holiday weekend. But when Skyline began to collect fares on Wednesday, July 5 ridership plummeted to only 1,245.
https://www.cato.org/blog/lessons-honolulus-new-train-system