"Imperial Capital[a] Highspeed Transportation Management Foundation"), commonly known as Eidan or TRTA, on April 1, 2004.

[4] TRTA was administered by the Ministry of Land, Infrastructure and Transport, and jointly funded by the national and metropolitan governments.

In 2024, the company made its initial public offering, raising $2.3 billion in what became Japan's biggest IPO since 2018.

Much effort has been made to make the system accessible to non-Japanese speaking users: Many stations are also designed to help blind people as railings often have Braille at their base, and raised yellow rubber guide strips are used on flooring throughout the network.

Due to the complexity of the fare systems in Japan, most riders converted to these cards very quickly even though there is an additional charge to issue it.

The Tokyo Metro is extremely punctual and has regular trains arriving 3 to 6 minutes apart most of the day and night.

A Note: Excluding the 8.3 km (5.2 mi) stretch between Wakoshi and Kotake-mukaihara shared with Yurakucho Line.

Major interchange stations, connecting three or more Tokyo Metro lines, include the following: Other major stations provide additional connections to other railway operators such as the Toei Subway, JR East, and the various private railways, including (but not limited to) the following: As of 1 April 2016[update], Tokyo Metro operates a fleet of 2,728 electric multiple unit (EMU) vehicles, the largest fleet for a private railway operator in Japan.

During the morning peak period, platform attendants (oshiya) are sometimes needed to push riders and their belongings into train cars so that the doors can close.