Fukutoshin Subway Line

This month will see the opening of Tokyo's newest subway line.  Here's an article from Metropolis about it:

More than 80 years after Tokyo’s first subway line opened between Asakusa and Ueno, the last major underground railway debuts as Tokyo Metro unveils the Fukutoshin line on June 14. First planned back in 1985, the Fukutoshin will travel 8.9 kilometers from Ikebukuro to Shibuya, with six stations in between. It connects with the Tobu Tojo, Seibu Yurakucho and Seibu Ikebukuro lines, and through service is planned with the Tokyu Toyoko line at Shibuya for 2012, completing a broad rail network linking southwestern Saitama with central Tokyo and Yokohama. 

Being promoted under the dubious slogan of “Subways that harmonize with towns and are loved by people along the line,” the Fukutoshin (the name means “subcenter”) is the ninth subway line to be operated by Tokyo Metro Co Ltd, which currently carries 5.9 million passengers a day along 195.1 kilometers of track via 179 stations. By comparison, the city’s other subway system, the metropolitan government-run Toei network, transports 2.03 million passengers daily and has 109 kilometers of track and 106 stations on its four lines.