European leader in
rail systems & solutions

Who we are Join us
Who we are

With more than 90 years’ experience in France and across the world, TSO puts its expertise to work on:

  • • Track construction, replacement and maintenance
  • • Electrification and catenary upgrades
  • • Survey and rail software development
  • • Rail safety
  • • Maintenance, repair and rebuilding of powered rolling stock

Developing synergies between the specialties of TSO and the complementary expertise available within NGE allows the Group to offer a comprehensive package for the most technically demanding projects. This ability to deliver multi-disciplinary projects is perfectly illustrated in the delivery of major projects, such as the Oloron-Bedous rail link, the Luxembourg tramway or Cuenca Tramway (Ecuador).

What we do
Track construction Track construction
Track construction

TSO is able to deploy a wide range of skills, from design all the way through to commissioning

  • • Conventional lines,
  • • high speed lines,
  • • metros and tramways...
Track renewal and maintenance Track renewal and maintenance
Track renewal and maintenance

Renewal works cover all the major maintenance operations for track, switches and crossings, and catenaries. These maintenance activities may be carried out in parallel with upgrading works, such as track realignment for operating speed increase, relocation of switches and crossings, longitudinal profile lowering for electrification.

  • • Renewal and upgrading of existing lines
  • • Rail replacement /BOA TRAIN
    • • Replacement of switches and crossings
    • • High output plain line renewal
    • • Track rehabilitation in confined area
Electrification and OLE Renewal Electrification and OLE Renewal
Electrification and OLE Renewal

TSO can provide you with appropriate answers to complex requirements with safety at the core of our priorities. Our teams are focused on delivering turnkey projects and helping you with your electrification and remodelling projects.

Our dedicated project team ensures the proper delivery of our projects with a short decision-making process, appropriate answers and resource optimisation. Our range of services include :

  • • Electrification of new lines (conventional and high speed),
  • • Remodelling and maintenance,
  • • Project planning,
  • • Principle and basic design, detailed design, etc.
Survey survey

In addition to high level site surveys, TSO uses a 3D scanner & GPS to create a point cloud of the surveyed infrastructure. Following the survey the cloud point file is combined in the office to allow further analysis in order to avoid the need to return to site in case any information is missing. We are able to reproduce in detail OLE structures or create and surface model of the civil asset surrounding the OLE structure (overbridge, retaining wall etc.).

3D surveys also allow us to undertake a clearance and gauging exercise when records are missing or inaccurate.

How we do it

Health & safety

Health and safety is at the centre of everything we do, from the daily routines in our offices to our customers’ work sites and our actions in our neighbouring communities. Our aspiration is to conduct our business with zero harm to people and to create a healthy and safe environment for our employees, contractors, communities, and customers.

Health & safety


TSO Research and Development is driven by our customers, who face today’s major challenges: achieving energy efficiency, lowering cost of construction and maintenance, reducing our environmental footprint, and meeting high standards of health, comfort, and well-being to the passengers. Together with our partners and customers, our R&D teams develop the most innovative products, solutions, and services, as well as advanced manufacturing processes.


Quality & accreditations

TSO recognises the importance of effective governance, assurance and improvement in the successful delivery of its activities. We demonstrate our commitment to quality management by ensuring arrangements are in place for effective operational planning and control, and objectives are set for customer satisfaction and quality. These objectives are reviewed and measured against how well we perform against our Integrated Management System (IMS) - a process-based system compliant with Quality Management (ISO 9001), Environmental Management (ISO 14001) and Occupational Health and Safety Management (BS OHSAS 18001) management system requirements.

Quality & accreditations


The Code of Ethics adopted by NGE is also part of the right line of our approach. It addresses the whole managers and employees of the Group and supplements, without replacing them, the statutory provisions Convention or Convention in force in all countries in which Group is active. The rules and principles it contains are binding on all in all circumstances.

Applying this code is a priority to ensure growth responsible in respect of the general interest and to build lasting relationships with our customers. It is by respecting these commitments everywhere we operate that we can continue to grow and be proud of our achievements.

What we delivered
Construction of the central section of Crossrail
Construction of the central section of Crossrail Employer : Crossrail Limited
Partners : Alstom & Costain
Project CTRL2 (Channel Tunnel Rail Link – Phase 2)
Project CTRL2 (Channel Tunnel Rail Link – Phase 2) Employer : HS1
Partners : Alstom & Carillion
Construction of « LGV Sud Europe Atlantique » (SEA)
Construction of « LGV Sud Europe Atlantique » (SEA) Employer: LISEA
Location : Tours-Bordeaux, France
Construction of the Panama metro line 2
Construction of the Panama metro line 2 Employer: MPSA – Metro Panamá
Location: Panama, Panama
Extension of metro line 2B, Santo Domingo
Extension of metro line 2B, Santo Domingo Employer: OPRET
Location: Santo Domingo, Dominican Republic
Tramway, city of Cuenca
Tramway, city of Cuenca Employer: ALCALDIA DE CUENCA
Location: Cuenca, Ecuador
Tramway Luxemourg
Tram Luxemourg Employer: LUXTRAM
Location: Luxembourg, Luxembourg
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Our people

Passionately human

Our ethos is to foster a culture based on employee wellbeing, a supportive working environment, aspiration, engagement, training & development, high-performance, develop leaders that shape, influence and lead to become the next generation of future entrepreneurs.

At TSO we build an environment where equality and diversity permeates the DNA of our values and ensure that the business adopts principles of good practice which are best practice and legally compliant.

Join us
Site Civil Engineer
Meet Ambre

“I’ve always wanted to excel myself to succeed in the challenges I’ve been set. That’s what’s helped me to progress.”

Rail Operations Director
Meet Bouazza

“Rail engineering has been my passion for 28 years. A passion to which I’ve devoted all my energy for all our customers.”

Bid manager
Meet Derek

“5 years on, new opportunities are opening to which I know TSO will trust me to make valuable contributions.”