Colas Rail initially set up in Morocco in response to the lines 01 & 02 project of the Rabat-Salé tram line. The local railway market was promising at the time, particularly the numerous projects launched by the Moroccan national rail office (ONCF). Colas Rail took this opportunity and decided to create a subsidiary in Morocco, obtaining more than three tenders and making ONCF its main client.

Operating for more than 10 years in the Moroccan railway sector, Colas Rail Morocco has expanded the scope of its operations spectacularly on the basis of its capacity to carry out complex turnkey projects, providing solutions with integrated methodologies for projects with multiple lots involving multiple business lines, such as tram lines, high-speed lines, substations and laying shipping lanes. Throughout this period, Colas Rail Morocco has positioned itself as a leader in the sector by providing its customers with high-level expertise and fulfilling its commitments.

• 2008–present: Maintenance and renewal of the national rail network — Partnership with ONCF for preventive and corrective maintenance of >750 km of tracks; on average, ~120 km of track renewed per year using ballast trains and modern equipment.
• 2012–2016: Casablanca tram network — Construction of 31 km of lines and installation of track and signaling systems for Casa Transports.
• 2013–2017: Tangier–Kenitra High-Speed Rail Line (Phase 1) — Laying and renewal of 185 km of track, installation of overhead lines and engineering structures for the ONCF.
• 2014–2018: Rabat–Salé tram network — Laying of 26 km of track, integration of overhead lines and signaling equipment, delivered in 2018.
• 2015–2019: Doubling of the Casablanca–Marrakech line — Installation of 180 km of new track and renewal of existing track to improve capacity and service reliability.
• Ongoing project: Marrakech–Tangier — Modernization and doubling of the track to strengthen the north–south corridor; several dozen kilometers already installed or modernized.
• Ongoing project: High-Speed Trains (TVE) — National program for new very-high-speed connections and corridor modernization; Colas Rail Maroc selected to lay and renew hundreds of kilometers of track.
• Upcoming project: Extension of the Tangier–Mediterranean line — Work for the Tangier-Mediterranean Port Authority on approximately 35 km of track and installation of freight-specific signaling systems.