James,
I located the data and photos of the locomotive I saw in Golfito, Costa Rica. According to the builder's plate, it is a Baldwin, built in 1940, with the number 62445. The Baldwin classification is 2-8-2-16s 102. I don't remember where I got that number--possibly off the side rods. The gauge is 42". The lettering on the tender is Ferrocarril Del Sur.
The half dozen or so photos I took are of disappointing quality, but they do show some detail. I don't have the negatives, but I guess I don't have any further use for the photos, so you can have them it you want them.
Sincerely,
Mark Yeamans