Greek rack railway
The Odontotos rack railway, connecting the seaside town of Diakopto to the mountain village of Kalavryta in Greece’s northern Peloponnese, is a rare example of a rack-and-pinion railway, whose engines complete steep climbs by using a gear and a track with teeth. It also operates with one of the smallest gauges in the world, only 75cm (about 2½ feet).
On the 22-kilometer route, with a maximum gradient of 17.5%, the train climbs 750 meters in a little more than an hour, going through tunnels and passing scenic mountains and waterfalls.