Tokyo Metro: Asia's Oldest Subway Goes Public

Tokyo Metro shares rocketed more than 40 percent on their stock market debut, raising $2.3 billion in Japan's biggest initial public offering (IPO) in six years (Credit: AFP)

Every day six and a half million people ride Tokyo Metro's nine lines, part of a dizzyingly complex transport network serving the Japanese megacity and its sprawling suburbs.

Tokyo Metro shares rocketed more than 40 percent on their stock market debut Wednesday, raising $2.3 billion in Japan's biggest initial public offering (IPO) in six years.