The MRT Putrajaya Line (previously known as the Sungai Buloh-Serdang-Putrajaya Line) includes a 13.5km underground section featuring 11 stations with world-class facilities and amenities. These stations are located at the very heart of the Kuala Lumpur city centre and are geared towards improving chronic traffic congestion in the region. The underground portion of the alignment stretches from Sentul through Titiwangsa, to Hospital Kuala Lumpur, Ampang Park, KLCC, Conlay, Chan Sow Lin and Bandar Malaysia North before ending up in Bandar Malaysia South.

Colt Engineering was awarded by MMC Gamuda of a total of 11 MRT Underground Stations for Performance Louvres Works. Work shall expect to complete by 2022, and commencement of full service in the first quarter of 2023.