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Rapport du COI et annonce d’Elisabeth Borne : une reconnaissance du rôle primordial du secteur ferroviaire


Siège social

  • Adresse :
    84, avenue Paul Santy
    69371 LYON CEDEX 08
  • Téléphone :
    +33 (0)4 78 77 88 00
  • Site internet :
  • Email :

Secteurs d'activités

  • Traction transformers Design and Manufacturing

Autres secteurs

Power transformers for high and very high voltage fixed installations, medium and high power: primary distribution, railway lines and industry. Maintenance and Service on site or in the factory.

Informations financières et juridiques

  • Actionnaire :
    COGERFY 40%; SIPAREX 40% ; CADRES JST Transformateurs 20%
  • Forme juridique :
  • Capital en € :
    € 7 452 030
  • CA ferroviaire 2019 en € : 14 000 000
  • CA ferroviaire à l’export 2019 en € : 11 600 000
  • Effectifs ferroviaires : 54


  • GIRAL Stéphane [Chief Executive Officer]

Descriptif / Historique

Founded in 1905 in Lyon, JST transformers is specialized in the design, manufacturing, and maintenance of oil immersed electric transformers for industrial use.

Independent of large groups, and with close to 70 years of experience in Traction, we are a recognized supplier to the major rolling stock manufacturers such as Alstom Transport, Bombardier Transport and Hyundai-Rotem.

We also provide the best service in operation for major operators such as SNCF, RATP, SBB, PKP, CFL, SNCB and KORAIL.

Our integrated process from design to validation, mastery of major components through our subsidiaries, our application of standards including IRIS, and our global presence, enable us to support our customers in new, renovation and innovation, for any type of application.


  • Expertises, repairs, renovation, maintenance and spare parts
  • Oil immersed Inductances and Reactors: DC inline / smoothing Filter / 2F
  • Traction transformers for EMU / Intercity / regional trains
  • Traction Transformers for Locomotives
  • Traction transformers for High or Very High Speed Trains



    IRIS, EN 15085, ISO 14001, OHSAS 18001, ISO 9001


    Transformers for Alstom transport, Bombardier Transportation, Hyundai-Rotem, Indian Railways (ICF), TURASAS.
    Services and Spare parts for SNCF, RATP, SBB, PKP, CFL, SNCB and KORAIL.


  • Isotransfo, Fundão, Portugal
  • JST Transformers India, Baddi, India
  • JST Maintenance, Crissey, France


  • JST Transformateurs, Lyon (France)