Oriental Consultants Global Co., Ltd. (OC Global / OCG) is one of Japan’s preeminent international engineering consulting firms. Originally tracing its corporate origins to 1957, OC Global was formally established as a dedicated global entity in 2014 by integrating the overseas divisions and historical track record of Oriental Consultants Co., Ltd. and Pacific Consultants International (PCI). Headquartered in Tokyo and operating as a core subsidiary of Tokyo Stock Exchange-listed Oriental Consultants Holdings Co., Ltd. (TSE: 2498), OCG has delivered social and transport infrastructure across more than 150 countries.

In the railway and transit domain, OCG acts as the trusted general consultant, lead designer, and supervising engineer for national governments, public transit corporations, and multilateral funding institutions (including JICA, ADB, and the World Bank). The firm has played a pivotal role in landmark urban rail and high-speed projects, notably managing the multi-phase rollout of the Delhi Metro in India, the Jakarta MRT and Jabodebek LRT in Indonesia, the North-South Commuter Railway (NSCR) and Metro Manila Subway in the Philippines, the Dhaka Metro (MRT Lines 1, 5, and 6) in Bangladesh, and the historic Marmaray intercontinental submerged railway tunnel crossing the Bosphorus Strait in Istanbul, Turkey.

OC Global combines Japanese engineering precision with global technical standards, leading advancements in Building Information Modelling (BIM/CIM), digital twins, seismic-resistant underground station design, and the establishment of national railway training institutions (such as the Philippine Railway Institute) to ensure sustainable long-term operations and maintenance.