World’s narrowest public cogwheel railway 750mm (2 ft 5 1⁄2 in) gauge built 1890 - 1895 with total length of line 22,3 km and max. slope over 17,5 % [ ΟΔΟΝΤΩΤΟΣ ] in Greece.
The line descends from Kalavryta at 720 m altitude to Diakopto village at sea level through the impressive Gorge of Vouraikos river. Mega Spilaion (Great Cave) monastery situated halfway the line, built 362 AD, is the oldest monastery in Greece.
The first 4 steam engines were built by CAIL in Paris 1891 - 1899. Since 2007 the line is