Road traffic in the Algiers city centre has become a major problem in recent years for the Algerian government, who therefore decided to launch a project to extend the underground railway system. 
Colas Rail worked on this project in partnership with the Algerian public works company Kou.G.C.

Extension A involves extending the line by 1.7 km north of Algiers and includes two new stations in the heart of the old city. Extension C, meanwhile, will extend the existing underground system by 3.6 km south of the city and includes three new stations.

On this huge project, Colas Rail is responsible for the track works, power supply, ventilation and smoke extraction, low-voltage system and ticketing and for the overall coordination and systems integration.