INANOGUMI is a team of craftspeople handling the electrical outfitting, interior work and piping of new railway cars — along with modification and maintenance, and electrical outfitting in shipbuilding. With 124 staff across four nationwide bases (Yokohama, Higashi-Osaka, Niigata), we work alongside Japan's leading rolling-stock makers — J-TREC, Kinki Sharyo, Kawasaki Railcar, Niigata Transys — keeping society's arteries moving, from Shinkansen to limited express and commuter trains.
"A single wire
can set millions of lives in motion."
What we handle is, centered on the electrical outfitting of the thousands of wires, gauges and control devices running through each car, the interior work that creates a comfortable cabin and the piping that supports the car's functions — the whole craft of making a car run. Railway cars are society's most trusted public infrastructure, carrying many lives 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 modification, maintenance and shipbuilding. With electrical work at the core, we take on railway and marine outfitting — including interior and piping — as a one-stop service.
For newly built Shinkansen, limited-express and operator vehicles, we handle electrical wiring and equipment installation, plus interior work and piping — covering vehicle outfitting broadly. Active at J-TREC, Kinki Sharyo and Kawasaki Railcar.
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.
Received a letter of appreciation from JR East Technology Co., Ltd. for completing one-man (driver-only) operation conversion work on rolling stock in the Tokyo metropolitan area.
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.
You're never thrown onto the shop floor by yourself. You work as part of an Inanogumi team, with a supervisor always on site — there's always someone to ask.
For your first 1–2 months a senior stays by your side for on-the-job training, teaching you step by step, starting with how to hold a tool. Most of our staff started with no experience.
Earn a real trade with our qualification support. Grow from beginner to skilled worker to team leader. Railway work won't disappear — build a long, stable career.
Your first two weeks cover safety education and the fundamentals: handling tools and on-site rules.
Work alongside seniors in a team. In about 1–2 months you'll grasp the flow and steadily take on more.
We back qualifications such as the rolling-stock manufacturing/maintenance technician through our support program. Gain a real trade.
With experience, become a leader who runs the floor and mentors newcomers — a long-term career.
With one-on-one guidance from veterans and qualification support, you can grow steadily even from zero. Gain a trade and work with pride for the long run.
Casual chats and facility tours are welcome too. Apply easily below — we'll get back to you within 1–3 business days.
We'll contact you within 1–3 business days.
For urgent matters, call 045-353-9454.
Submission failed. Please contact us by phone (045-353-9454) or email (ryo@inanogumi.com).
We want supportive relationships with fellow manufacturers. If you're facing challenges in your business or on the floor, talk to us first.
"Lost work all of a sudden," or "stretched too thin." As fellow makers, we'll exchange information and look for solutions together. Count on us as someone to talk to.
"Short on materials," "too many hands." Don't carry it alone — talk to us first, and we'll think through what we can do together.
"No successor," "the company is running out of steam." We'll discuss, in strict confidence, how to keep the business going and where your employees can go.
We have actively taken on employees from companies forced to close. We'll catch those about to lose their place to work.
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
