WATER CISTERN AND DRAINAGE GUTTER
I assume that this was probably for supplying water for the Japanese Sugar Train prior to WW II.
You can click on the little "i" in the circle (likely beneath the primary photo on your screen), and then click "Map" for an interactive map showing where each of the photos of this gallery was taken.
Also, feel free to leave comments in the comment box below. I would especially love to hear from anyone who has more information on this. Am I correct that this was part of the railroad infrastructure?