Founded in 1840 by Iwakichi Kajima and headquartered at Kajima Corporation HQ in Tokyo, Kajima Corporation is one of the world’s most experienced and technologically advanced construction and civil engineering conglomerates[cite: 5]. Operating across civil engineering, building construction, real estate development, and engineering consulting, Kajima employs more than 20,000 professionals across Asia, North America, Europe, and Oceania.

Kajima has played a defining role in modern railway history. The firm was instrumental in constructing Japan’s original Tokaido Shinkansen bullet train infrastructure in the early 1960s, as well as the historic 53.8-kilometer undersea Seikan Tunnel linking Honshu and Hokkaido. In contemporary high-speed transit, Kajima continues to deliver critical packages for the Hokuriku Shinkansen and Hokkaido Shinkansen extensions, as well as deep-shaft mountain and urban tunnel contracts for the Central Shinkansen Linear Chuo Maglev line.

Internationally, Kajima’s civil railway portfolio spans turnkey design-and-build and joint-venture contracts for major transit systems. Notable international deliveries include elevated and underground bored tunnel contracts for the Singapore MRT (Thomson-East Coast Line and Downtown Line), major civil packages on the Taiwan High Speed Rail corridor, and extensive urban transit works across Southeast Asia. The company is also an industry leader in smart construction, utilizing its proprietary A4CSEL (Automated Autonomous Advanced Actions for Construction Sites) system for remote and autonomous heavy machinery operation in challenging tunneling and earthwork environments.