Singapore Kim Chuan Depot

The Kim Chuan Maintenance Depot is the world’s first underground mass rapid transit facility of its kind and one of the largest depots in the world. 

More than 0.62 miles (1 kilometer) long and 492 feet (150 meters) wide at mid-point, it is situated 66 feet (20 meters) below ground. It serves as a stabling and maintenance facility for up to 70 three-car driverless trains operating on the Circle Line and a future Eastern Region Line. 

WSP served as the mechanical, electrical and fire engineering consultant, and partnered with the client to implement major cost savings of approximately US$70 million. Combining the original two-level design into a single-story structure produced major savings on the project.

Extensive studies, including fire engineering and Computational Fluid Dynamics (CFD) simulation analysis, were conducted to confirm that WSP's recommended option was feasible. WSP subsequently assisted with obtaining the necessary statutory approvals.

Sustainability and energy efficiency were key design targets. WSP minimized the use of air-conditioning and artificial lighting by strategically placing mechanical exhausts, skylights for daylight harvesting, and air wells for fresh air intake to serve the underground facility. 

WSP's contribution to the project earned the firm the Land Transport Excellence Award “Winner for Best Design Infrastructure Project Partner 2010.” WSP was also recognized by the Association of Consulting Engineers Singapore with the Design Excellence Award in 2009.