The story
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. In 1965 a typhoon caused the collapse of a retaining wall, and the Onahama - Ena section formally closed in 1967. The passenger service on the Izumi - Onahama section ceased in 1972.
From Wikipedia’s article on Fukushima Rinkai Railway, shared under CC BY-SA 4.0.3