It has recently gained additional infrastructure in the form of the Nanakuma Line, in addition to the Fukuoka City Subway and the Chikuhi Line.
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At Sendai Station, the line crosses under the Tōhoku Main Line and its platforms, similar to the situation with the Keiyō Line in Tokyo and the Chikuhi Line in Hakata (which connects via the Fukuoka Airport Subway Line).
The Fukuoka City Subway Number 1 Line (now the Kūkō Line) opens accompanied by a mutual operating agreement between it and the Chikuhi Line.