In October 2018, we celebrate the start of the civil engineering works of line 16 of the Grand Paris Express. Three sites of the Grand Paris Express : La Courneuve, Le Bourget and Saint-Denis / Saint-Ouen welcome 6,000 people including 700 high school students in dedicated educational workshops.

After the celebration of the first three site celebrations called "KM" (symbol of the kilometers to go until the Grand Paris Express is complete), the series was spread over three weeks of roaming and twelve days of opening. from the "Express Express" to the inhabitants and schoolchildren of Seine-Saint-Denis.

On the program of this KM4, artistic and cultural meetings with artistic performances, popular ball, concerts, meals of construction site, urban walks but also educational with the exhibition of the models of stations of the line 16, the workshops youth and meetings with architects.

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