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Leading the way to greener and smarter mobility, worldwide.

Our ambition is to accompany all transportation stakeholders in meeting tomorrow’s mobility challenges. We strive to provide them with the most efficient and digital mobility systems, while further improving the environmental friendliness of our solutions. 

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At Alstom, we value curious and innovative people who are passionate about working together to reinvent mobility, making it smarter and more sustainable. We are building an agile, inclusive, and responsible culture, where diverse people are offered opportunities to learn, grow and advance in their careers, with options across functions and geographies.

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On-board traction transformers: Effective solutions for all railway electrical networks worldwide


On-board traction transformers at a glance

  • A combination of solid experience and innovative solutions
  • Dedicated centre of excellence for traction transformers
  • R&D, engineering, manufacturing expertise
  • Global maintenance solutions designed for customers and operators

With a solid proven background in the transformers industry dating back to 1920, Alstom is today one the leaders in the on-board traction transformers business, with a solid global based supporting train manufacturers and operators.

A wide range of applications

Alstom covers all transportation segments from light rail, metros, commuter to regional trains and high speed as well as locomotives. Depending on the vehicle type, we employ a great variety of designs and installations, while including a standardisation approach, to meet all Alstom and non-Alstom car builders’ requirements for a highly reliable, cost effective and efficient solution.

Traction transformer for locomotive © Alstom
Traction transformer for locomotive © Alstom

Engineering & manufacturing

With the most up-to-date simulation, validation and testing tools and stringent validation procedures, Alstom ensures that customers receive the latest proven technology to power both Alstom and non-Alstom trains. Our products comply with the latest railway norms and standards. Our up to date manufacturing equipment and highly skilled workforce, together with our purchasing and quality policies enable us to supply high-quality, ultramodern products.

Innovation and R&D

Our traction transformer activities are supported by innovation and development programmes. Alstom’s technology solutions are based on eco-design principles: low noise, energy efficiency , better MTBF and low lifecycle costs. For instance, we have developed a naturally-cooled transformer for regional application: No fans needed as air flow from train speed is directed towards the radiators, which significantly reduces Total Cost of Ownership. Also, in our constant drive to limit environmental impact, our products are highly recyclable.

units annual capacity
transformers in commercial service
2 to 10
MVA: a full range of power ratings