Tokyo Underground Railway

The Tokyo Underground Railway (Japanese: 東京地下鉄道) was a railway operator that once operated underground railways, trams and buses in Tokyo City, Tokyo Prefecture, Japan from 1920 to 1941.

Founded in August 1920 by Tokuji Hayakawa, known as the "father of the subway", the company began construction of what is now the Tokyo Metro Ginza Line between Asakusa and Shimbashi in 1925. It was the first company to build a subway line in Japan and in Asia. Together with the Tokyo Rapid Railway, which constructed the Ginza Line section between Shimbashi and Shibuya, it is considered a precursor to the present-day Tokyo Metro.

In 1941, following the outbreak of World War II, it was merged with the Tokyo Rapid Railway into semi-public Teito Rapid Transit Authority under the Land Transportation Business Adjustment Law.