Tokyo Metro Ginza Line Groundbreaking

July 27, 1927, saw the groundbreaking for the Tokyo Metro Ginza Line, Asia's first subway, between Ueno and Asakusa. Engineer Noritsugu Hayakawa led the project amid rapid urbanization following the 1923 earthquake. The 2.2 km initial segment featured innovative cut-and-cover tunneling and electric multiple units from Hitachi. It alleviated street congestion and set standards for Japanese urban rail. Key challenges included seismic design and integrating with existing tram networks. The line's success influenced post-war expansions, becoming a model for efficient mass transit worldwide and symbolizing Japan's modernization.