Here at Transit Maps, we love a good cutaway diagram of station layouts, and this one is a classic. Sent our way by David Auerbach, it shows the combined Paris Métro/RER Châtelet–Les Halles complex in Paris – a transit hub so massive that Métro Line 4 has two separate stations within it!

On this diagram, the white SNCF tunnels shown as “en projet” correspond to the modern RER Line D, which began service in 1987 using the centre platforms on the RER level. Of course, the station is even more complicated these days with the additional Métro platforms for Line 14 jammed in between the Châtelet platforms for Lines 1 and 4!

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