INANOGUMI CO., LTD. is a specialist team dedicated to the electrical outfitting of new railway vehicles, rolling stock modification and maintenance, and electrical installation in shipbuilding. With 124 employees across four operating bases in Japan, we work alongside J-TREC, Kinki Sharyo, Kawasaki Railcar, Niigata Transys, and other leading manufacturers — powering Shinkansen bullet trains, limited express trains, commuter rolling stock, and marine vessels.
"A single wire
can set millions of lives in motion."
Every railcar contains thousands of wires, instruments, and control devices — all installed by hand. Railway vehicles are among the most trusted forms of public infrastructure, safely carrying countless passengers every day.
That is why we hold firm to the same three principles we have followed since day one: millimeter-level precision, hands-on craftsmanship passed from veterans to the next generation, and a team culture built on open communication and mutual support.
From new builds to modifications, maintenance, and shipbuilding — we deliver end-to-end electrical outfitting for rail and marine projects.
We perform complete electrical wiring, equipment installation, and interior electrical work for newly manufactured railway vehicles — including Shinkansen bullet trains, limited express trains, commuter rolling stock, and public transit vehicles.
We handle vehicle refurbishment, retrofit projects, cable reconnection, and ongoing maintenance for operators and manufacturers — including JR East Technology, Keio Juki Seibi, and Shinano Railway.
At JMU (Japan Marine United) and related facilities, we handle electrical equipment installation and wiring for various vessels, applying the same precision and reliability we have built in the railway sector.
Over 30 years of deep technical expertise, trusted partnerships, and a culture that develops people — these are the foundations of our competitive edge.
Starting from our long-standing partnership with Tokyu Car Corporation (now J-TREC), we have expanded to work with Kinki Sharyo, Kawasaki Railcar, and Niigata Transys. Multiple clients have presented us with letters of appreciation for on-time delivery and productivity improvements.
Experienced mentors provide hands-on guidance from day one, while our qualification support program helps employees build long-term careers. Many of our 124 team members started with no prior railway experience.
Operating from Yokohama, Higashi-Osaka, Niigata Akiha, and Niigata Seiro — plus three cohorts of trainees from Mongolia — we maintain a flexible organization capable of supporting rail manufacturers across Japan.
Rail transport is central to a sustainable, low-carbon future. This is work with lasting demand, offering professional pride, real-world skills, and long-term career stability.
Key facts about our company, our locations, and the clients we work with.
From a small sole proprietorship in Yokohama to a four-base organization working with Japan's leading rail manufacturers.
Founded as a sole proprietorship in Yokohama. Began contracting electrical work related to railway vehicles at Tokyu Car Corporation, now J-TREC.
Established as Yugen Kaisha Inanogumi. Continued electrical work inside Tokyu Car while also supporting retrofit work at railway depots through partner companies.
Opened a business account with Keio Juki Seibi Co., Ltd., leading to expanded modification work for JR lines, the Keio Line, and related rolling stock.
Increased capital from 3 million yen to 4 million yen and transitioned from a limited company to a joint-stock company.
Opened a business account with Kinki Sharyo Co., Ltd. and later increased capital to 10 million yen.
Appointed representative director of the cooperative association of partner companies inside J-TREC.
With the opening of a business account with Hokuto Co., Ltd., entered electrical contracting work for shipbuilding at JMU.
Established the Osaka Office inside Kinki Sharyo.
Accepted the first group of trainees from Mongolia.
Expanded operations by leasing part of a factory inside J-TREC for cable preparation work and received a letter of appreciation from Kinki Sharyo.
Opened a business account with JR East Technology Co., Ltd. and received another letter of appreciation from J-TREC.
Obtained the labor dispatch business permit and welcomed the second group of trainees from Mongolia.
Established the Niitsu / Niigata Office inside J-TREC and entered cab interior outfitting work.
Completed the Inano Building in Yokohama and began accepting high school interns.
Established Inano Holdings Co., Ltd. as a management company.
Accepted the third group of trainees from Mongolia.
Opened a business account with Kawasaki Railcar Co., Ltd.
Opened a business account with Niigata Transys Co., Ltd. and established the Seiro Office inside its facility in Seiro, Niigata, expanding to a four-base operating structure.
Reached 124 employees. Today, our four bases and diverse workforce support production sites for some of Japan’s leading rolling stock manufacturers.
Railway work is essential, stable, and rewarding.
Build a career with real skills — at one of our four locations across Japan.
Many of our team members came from entirely different industries. During your first one to two months, a senior colleague will work alongside you, guiding you through each step until the workflow feels natural. You will never be left to figure things out alone.
As a trusted partner to Japan's leading rolling stock manufacturers, we work on Shinkansen bullet trains, limited express trains, public transit vehicles, and more. Once you master these skills, you gain the stability of a profession with lasting demand — and the pride that comes with powering the infrastructure millions depend on.
For project inquiries, estimates, or recruitment questions — reach out by phone or email.
3-1 Okawa, Kanazawa-ku, Yokohama, Kanagawa 236-0043, Japan
Inside J-TREC Corporation
