CityRailTransit
Timeline of the Tokyo Ryutetsu K.K.

Suburban Railway

14-03-1916: Nagareyama Line > Mabashi -  Nagareyama (+5.7 km)
01-04-1933: Nagareyama Line > Heiwadai station added
24-12-1953: Nagareyama Line > Kogane-Joshi station added
03-02-1961: Nagareyama Line > Koya station added