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 and KLCC before ending up in Chan Sow Lin.

Colt Engineering Sdn Bhd was awarded by Sunway JV Gamuda for the Sentul West Station for the Fire Protection Works. Expected to handover by first quarter of 2022.