A private subway of 1927, a public authority and a nickname picked in-house.

Tokyo Metro is the nickname and trading identity of Tokyo Metro Co., Ltd., one of the two operators of the Tokyo subway. English Wikipedia says the company is a special company established on 1 April 2004 through the privatisation of the Teito Rapid Transit Authority, and that it runs nine lines: eight inherited from the authority and the Fukutoshin Line, opened in 2008. Japanese Wikipedia says the head office is in Tokyo’s Chuo ward, and that the other operator is the Tokyo Metropolitan Bureau of Transportation, which runs the four Toei lines.

The network is older than the company. Japanese Wikipedia says the Tokyo Underground Railway was founded by Noritsugu Hayakawa on 29 August 1920, began construction on 27 September 1925 and opened between Asakusa and Ueno in 1927, now part of the Ginza Line. English Wikipedia gives the opening date as 30 December 1927 and says the line was marketed as “the only underground railway in the Orient”. In 1941, it says, that company and the Tokyo Rapid Railway were absorbed into the newly established Teito Rapid Transit Authority, known in Japanese as Eidan.

That early railway left a body of poster design. The Internet Museum, in a report by Mikio Furukawa dated 14 February 2019 on the exhibition Image Collector: Sugiura Hisui at the National Museum of Modern Art, Tokyo, listed among the works on show posters by the designer Sugiura Hisui (1876–1965) for the Tokyo Underground Railway: two from 1927 announcing the opening between Ueno and Asakusa, one from about 1929 for the extension to Mansei-bashi and one for the opening of a subway store at Ueno in 1931.

The founding year now appears on the staff. Norimono News, reporting on 19 February 2020 from a press presentation, said Tokyo Metro would renew the uniforms of station staff, crews and service managers from 1 April 2020, replacing the uniforms introduced when the company was formed in 2004. It said the design concept was “simple stylish”, and that the badge on the front of the cap carried the words “SINCE 1927”, for the year the Tokyo Underground Railway opened.

The move from authority to company came in two steps, in law and then on the stock market. Japanese Wikipedia says the Tokyo Metro Co., Ltd. Act was promulgated on 18 December 2002, and that the national government and the Tokyo Metropolitan Government, which had held all the shares, sold half of them between them when the company listed on the Prime market of the Tokyo Stock Exchange on 23 October 2024.

A heart-shaped M on a bright blue square.

The name and the mark were both settled for the 2004 launch. Japanese Wikipedia says the formal name and the nickname Tokyo Metro were both chosen from entries collected inside the authority in its final period. It says the word metro, used in many parts of the world for an underground railway, goes back to London’s Metropolitan Railway of 1863.

The new mark replaced a letter with a letter. Japanese Wikipedia says the Eidan symbol was a stylised “S”, standing for subway and, it says, also for safety, security, speedy and service. Tokyo Metro adopted the “Heart M” in its place. Japanese Wikipedia, citing a Tokyo Metro recruitment page on its corporate identity, says the mark was commissioned from the British design company Wolff Olins.

Tokyo Metro says the heart-shaped M stands for Metro, the French word for subway, and reminds it that it serves the heart of Tokyo with heartfelt service. It says the background of the mark is bright blue, its primary corporate colour, chosen to convey an active, lively image in tune with its group ideal, “Keeping Tokyo on the Move”.

The mark rarely travels alone. Japanese Wikipedia says the Tokyo Metro name sits on a dark blue box beside the bright blue of the symbol, with bright blue always the main colour, and that the two boxes and two colours are shown together as a set the company calls its communication mark. Tokyo Metro says this combined mark is displayed at points of contact with customers, such as station entrances and train carriages.

Universal design for a more international city.

A city transit system is read in fragments: a glance at a map on a platform wall, a coloured stripe above a door, a letter on a post at the top of a staircase. The diagram map often becomes the brand itself. It straightens curves, evens out distances and turns a tangle of tunnels into a few clean lines, and people come to picture their city in that shape. Line colours then work as a public language. Once a line is red or green on the map, the same colour appears on platform walls, on direction signs and in the way people give directions, so a change of colour has to be carried through every sign, timetable and leaflet at once. Station names are the vocabulary of that language, and their lettering has to be legible from a moving carriage, in poor light and at a slant, which favours plain letterforms, generous spacing and strong contrast between text and background.

Above ground, the system has to announce itself among shop signs and traffic lights. Many networks rely on a single letter or a simple shape set on a post or a box at each entrance, lit at night and repeated so often that it reads as a symbol before anyone takes in the word. Below ground, some operators bring in artists so that each station has a character of its own, which also helps passengers recognise where they are. The smallest pieces carry the identity too: a ticket, a travel card or a validator has to show the same colours and marks at a scale that fits in a hand.

Colours agreed in 1970, retuned in 2014 and joined by letters in 2004.

The line colours are older than the heart. Japanese Wikipedia says line colours were introduced in July 1970, when the authority and the Tokyo Metropolitan Government set them together, based largely on the colours of the trains then running; the Fukutoshin colour followed in 1985. It gives the source of several: the orange of the Ginza Line from the car colour of the Berlin U-Bahn, the red of the Marunouchi Line from a British cigarette pack, the silver of the Hibiya Line from its stainless-steel cars, the green of the Chiyoda Line from the line colour of the JR Joban local service it was to run into, and the emerald of the Namboku Line from Japanese gardens along its route.

The colours were retuned rather than replaced. Japanese Wikipedia says a change was decided in 2014, with maps and station signs updated through 2016, and lists the new values from Tokyo Metro’s open-data developer guidelines, among them #FF9500 for the Ginza Line, #F62E36 for the Marunouchi Line and #009BBF for the Tozai Line.

Letters and numbers arrived with the company. Japanese Wikipedia says station numbering was introduced at the launch in 2004, and its line table pairs each colour with a letter: G for Ginza, M for Marunouchi, H for Hibiya, T for Tozai, C for Chiyoda, Y for Yurakucho, Z for Hanzomon, N for Namboku and F for Fukutoshin, so that Shibuya on the Ginza Line is G01.

The signs were redrawn at the same time. Japanese Wikipedia says the new signage system Tokyo Metro began installing at its launch was designed by REI, a design company in Shibuya, Tokyo. It says the system answered an ageing ridership, a more international city and a more complex network with universal design, simpler information without more or larger signs, and a typeface hard to misread even when blurred. It says the signs were trialled at Otemachi and Ginza, rolled out from October 2005 and reached the remaining stations, with some exceptions, by the end of March 2007.

For a design guide, Tokyo Metro shows how a subway can lay a 2004 corporate mark over colours fixed in 1970, add a letter and a number to every station, and keep each layer doing its own job. Compare JR East, one of the railways whose trains run through onto Tokyo Metro lines, and London Underground, home of the Metropolitan Railway that gave the word metro its start. For this guide we use heart blue, Ginza orange and Marunouchi scarlet with a sans, an unofficial interpretation; no product or logo is reproduced.

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