 The Onahama Horse tram opened a 762mm gauge line 5 km to its namesake town in 1907, and extended the line a further 5 km to Ena in 1916.The Onahama - Ena section closed in 1936, the company renamed itself the Onahama Port Railway in 1939, and converted the line to 1067mm gauge in 1941.The Ena Railway Co. rebuilt the Onahama - Ena section as 1067mm gauge in 1953.