TTJ Holdings (TTJ Design & Engineering)

Gates PCM Construction builds and maintains railway track — ballasted and slab — on Singapore's MRT network, and supplies track machinery, locomotives and wagons. It holds three current LTA trackwork contracts, including R1019, a six-year programme awarded in July 2024 to replace every rail fastening system on the North-South and East-West lines. A member of Japan's JR East Group since July 2023; 280 employees at December 2022.

OSCA Asia designs and builds office interiors from its Singapore headquarters at Aperia, Kallang, with offices in Kuala Lumpur and Ho Chi Minh City. The firm states it serves more than 500 multinational and local companies across Singapore, Malaysia, Vietnam and Indonesia. Its published portfolio names more than 40 client fit-outs — from 1,900 sq ft delivered in five weeks to 31,900 sq ft at Marina Bay Financial Centre — backed by in-house joinery and aftercare arms.

Puretech Engineering is a Singapore mechanical and electrical contractor established in 1995, wiring rail depots, airport terminals, shipyards and commercial buildings. Its current book spans four LTA rail contracts — Kim Chuan Depot, Hume Station, the Sengkang-Punggol LRT depot and Tengah Depot — plus the Shaw Tower redevelopment and the Mandai Lake Road resort development, and it fabricates switchboards and control panels rated to 22kV.