Presidential message


On June 2, 1919,Niigata successfully completed the in-house development of Japan’s first marine diesel engine, the M4Z. Ever since that time, we have always looked far ahead of the world (or market), sincerely and constantly providing society with products and technologies that serve the needs of the times. This year is the centennial anniversary of the birth of the Niigata Diesel Engine.

We wholeheartedly thank our long-time loyal clientele and everyone else who has been supportive of our company. We will continue our commitment to providing an extensive range of services with improved reliability while we make the best use of our manufacturing expertise.

Our company, Niigata Power Systems Co., Ltd., was founded on and driven by a pioneering spirit, experience-based technical expertise, and employee education and training that make the foregoing possible. As always, we adhere to our basic corporate philosophy of making continuous efforts to meet the needs of the times. Now in the midst of a major shift in history, we will reinvent ourselves, take on new challenges, and devote more passion and greater effort than our predecessors to develop the products, technologies, and services tailored to the needs of the new era to help realize an environmentally sustainable future society.

Koji Yahagi, President and CEO

Anniversary logo mark

This anniversary logo mark was selected from ideas solicited from within the company to mark the centennial anniversary of the birth of Niigata Diesel Engine.


Commemorative logo mark

The idea signified by the logo mark

This logo mark illustrates our image of Niigata brand diesel engines which are active and roaming around the globe. The logo expresses our deep gratitude to our loyal customers and our wish to retain worldwide patronage for the next 100 years.


The motif of the diesel engine in the logo mark is M4Z.

Centennial anniversary video

Photo Gallery »

100-year history



This is Japan’s first marine diesel engine developed and manufactured by Niigata Engineering Co., Ltd. (predecessor of Niigata Power Systems Co., Ltd.) and delivered for use on a fishing boat. This engine was sensational for being 30 percent more fuel-efficient than hot-bulb engines, which were the mainstream at that time. This is the origin of the 100-year history of Niigata brand diesel engines.

◆Milestone diesel engines influential in development and commercialization of subsequent engines



This stationary power generation engine was developed and completed in 1950. This model is smaller than the conventional diesel engines at that time, and manufacturing costs were reduced by enabling power adjustment by changing the number of cylinders. Thus, this model became the prototype for our modern medium-speed diesel engines.

M6F28S(550PS) and M6DS(1,000PS)

These models were developed in 1953 as diesel engines with an exhaust turbocharger. They were approximately 1.5 times more powerful than naturally aspirated diesel engines. Equipped with a turbocharger manufactured by D. Napier & Son Limited (UK), the M6F28S and M6DS were delivered for use on a merchant ship and on a fishing training boat for a fisherman’s high school, respectively.



This diesel engine was installed in 1956 on Japan’s first Antarctic observation ship the Soya. It was adopted as a replacement for the ship’s steam-powered main engine. The Soya was in service as Japan’s Antarctic observation ship until the sixth Japanese Antarctic expedition in 1962 and is now moored and preserved at the Museum of Maritime Science. (TN8E is still extant.)



This medium-speed engine was developed in 1979 collaboratively with SEMT and was delivered in 1982 for use on a fishing boat. At that time, this model was revolutionary in design and performance. The technologies adopted for its development laid the foundation for the development of our subsequent diesel engines.

◆Best seller diesel engines



In 1970, the 6L25BX was completed through many improvements of the L(6)F25. The first unit of this model was delivered for use on a 5,000-GT whaling ship. This model is representative of the 1970s diesel engines and was widely used as a main or auxiliary marine engine or as a stationary power generation engine.
Number built: approximately 2,150 units



Developed as a stationary power generation engine, the 16V32CX was delivered in 1986 for industrial power generation use. Among main engines for in-house power plants for industrial use, this became the top model for 5,000 kW class continuous power generation. Later, a long-stroke version, the 32CLX, was developed. There are still a number of 32CLX engines in service as diesel engines for remote island power generation or emergency power generation.
Number built: approximately 400 units



In 1988, the 6L28HX was completed as a marine diesel engine. Initially, this model was sold for use on fishing boats. Its sales soared when sold in combination with the Z-Type propulsion unit (Z-Peller). This is a Niigata best seller and still on sale.
Number built: approximately 2,400 units (still produced today)



This model was developed for use on diesel railcars for trains. In 1984, it passed the certification tests by the International Union of Railways (UIC). Then in 1986, the first unit was delivered. This model is still adopted for railway use by Japan Railways (JR) and third-sector and overseas railway companies.
Number built: approximately 1,120 units (still produced today)



This model was developed as a main or auxiliary engine for small vessels. In 1987, the first unit was delivered. This engine is still adopted as fishing boat engines, marine auxiliary engines, or railway locomotive engines. There are many units in use.
Number built: approximately 900 units (still produced today)



This low-speed diesel engine was developed in 1986 as a marine main engine with a higher cost-effectiveness and maintainability than its contemporaries. This is still our flagship model of low-speed engine for use mainly on fishing boats and merchant ships.
Number built: approximately 530 units (still produced today)

◆State-of-the-art diesel engines


L/V28AHX(2,070 to 6,660 kW)

These models were developed to ensure compliance with the IMO NOx Tier II regulations and to deliver better fuel efficiency than that of conventional diesel engines. The L-Type engines were delivered in 2010 as ferry main engines. The V-Type engines were delivered in 2016 as land engines for use in overseas power plants. The latter are also used as large marine main engines.


MG/L28AHX-DF(1,618 to 2,880 kW)

These models were developed through incorporation of the technical advantages of the gas engine 22AG into the 28AHX to ensure compliance with the IMO NOx Tier III regulations and adaptation to fuel diversification. These engines were delivered in 2015 as the world’s first dual-fuel engines directly connectable to FPP tugboats.


L/V28AGS(2,000 to 6,000 kW)

These models were developed as exclusively gas-fueled spark-ignition gas engines to ensure compliance with environmental regulations such as NOx regulations. These engines were delivered in 2013 for use in overseas power plants. Since 2014, they have been delivered for use in industrial power plants in Japan.

To learn of the 100-year history in more detail »