The story
The company was founded on 1 April 1969.
On 12 November 1970, the company opened the freight-only line between Kita-Kashima (present-day Kashima Soccer Stadium) and Okunoyahama. On 14 March 1985, the company opened the passenger line from Mito to Kashima Soccer Stadium.
From Wikipedia’s article on Kashima Rinkai Railway, shared under CC BY-SA 4.0.3
