Where the lines meet: the biggest interchange stations in six cities

In HelloSubway a station is an interchange when two or more of the lines we have call at it. The share varies a lot. In New York, 153 of 433 stations are interchanges, about 35 percent. In London it is 70 of 214, about 33 percent, and in Tokyo 67 of 226, about 30 percent. Seoul has 93 of 486, just under 20 percent, Paris 60 of 309, about 19 percent, and Singapore 25 of 145, about 17 percent.

New York, nine lines in one place

Atlantic Avenue-Barclays Center in Brooklyn is served by nine of our lines: 2, 3, 4, 5, B, D, N, Q and R. Times Square-42nd Street, 14th Street-Union Square and 34th Street-Herald Square each have eight. Fulton Street and West 4th Street-Washington Square have seven. At the bigger ones the walk between lines can be long.

London, Paris and Tokyo

King's Cross St Pancras has six lines and is the busiest hub in our London data. Baker Street has five, and Paddington, Edgware Road, Embankment and Liverpool Street have four. In Paris, Châtelet and République each have five lines, and Nation, Saint-Lazare and Montparnasse - Bienvenüe have four. In Tokyo, Otemachi has five and Shibuya, Ikebukuro and Iidabashi have four.

Seoul and Singapore

Seoul's busiest in our data are Seoul Station, Wangsimni and Gongdeok, each with four lines. Singapore's are Dhoby Ghaut, Marina Bay and Outram Park, with three each. Dhoby Ghaut is the one to remember: it is where the North South Line, the North East Line and the Circle Line meet, and the first stop of the Circle Line in the game.

Finding your way

Large interchanges reward a little preparation. Follow the line colour and the station code on the signs, because the exit and platform names change but the codes do not. In Paris, the platform signs name the last stop on the line rather than the number, so know the terminus. In New York, check whether the train you want runs express or local before you cross the platform. In Tokyo, leave a few extra minutes at the biggest stations, since there are often many levels and exits. The line guides have the full station lists if you want to study a hub before you go.