名古屋市営地下鉄東山線
The Sakura-dōri Line was first envisioned in the Urban Transportation Council Report No. 14 (1972) as an underground line running from Nakamura Kuyakusho to Imaike, and was intended to relieve the central portion of the Higashiyama Line, which in the late-1970s operated with a crush load capacity of 250% during rush hour.