I've just been browsing photos on Google Earth and one shows a 'train' as is commonly seen in resorts throughout the Med to ferry tourists around the resort. The one in the photo has 3 or 4 carriages each carrying a dozen or more passengers. It doesn't seem to match the description of the Yellow or Red trains used for excursions in other threads.
Does this train run between Platanias and Rethymnon or just locally in Platanias? Any idea of fare prices?