Wong was responsible for systems design and construction management of the $120 million Muni Metro Turnback (MMT) LRT Project. The MMT extends Muni Metro Light Rail Transit Line underground approximately one mile from Embarcadero Station to a tunnel portal connecting to the Mission Bay surface line. The MMT Project includes 800 ft of bored tunnel, cut-and-cover structure, and an extensive underground turnback complex with two pocket tracks. The MMT improves turnback operations, reduces headways, and provides underground train storage, thus enabling Muni to significantly increase system capacity.

The MMT systems include traction power distribution and overhead contact system, gap breaker stations, train control, communications, and tunnel ventilation fans with associated electrical power distribution and control systems. A CCTV system enables monitoring of the tunnel portal and operations within the Turnback structure. The tunnel ventilation system consists of a new ventilation structure with three 450 hp fans, additional ventilation fans at Embarcadero Station, and a microprocessor-based fan control system.

An essential part of the Project is the installation of a new fiber optic communications backbone system extending 6 miles in existing underground tunnels from the MMT to Muni Central Control. Modifications at Central Control provide for monitoring and control of the MMT ventilation fans, communications, train control, and communications systems.