North–South Axis

The first section of this tunnel was opened on 4 October 1976 between Brussels-North and Lemonnier premetro station.

The tunnel then crosses the municipality of Saint-Josse-ten-Noode up to Rogier where it connects with the Brussels Metro.

It then enters the City of Brussels, and stops at De Brouckère (with again a connection with the metro), Bourse - Grand-Place/Beurs - Grote Markt, Anneessens-Fontainas and Lemonnier.

The tunnel then crosses Saint-Gilles, stopping at Brussels-South railway station (where it connects with the train and the metro), at Porte de Hal/Hallepoort (where it connects with the metro), at Parvis de Saint-Gilles/Sint-Gillis Voorplein, and at Horta.

In phase 1, the existing tram tunnel will be transformed into a metro line.

Map of future Metro line 3 . The grey part has to be constructed. Station " Constitution / Grondwet " will be named " Toots Thielemans " in more recent plans.