• GE T& D (formerly ALSTOM) (USA, Brazil, Germany, Italy, Mexico)
• Siemens (Turkey,Germany,Egypt , Brazil)
• ABB / Hitachi (Sweden, Singapore, South Africa, Egypt)
• Trench Italia
• Actom, South Africa
• Emek, Turkey
• Arteche, Spain
• Coelme Spa, Italy
• Toshiba , Brazil
• Gural Electik, Turkey
• Zeto, Russia
• Elsewedy Electric, Egypt
• Hapam, Netherland, Poland & Vietnam
• Europower Turkey
• Pfiffner, Brazil & Turkey

• E T&D India Ltd. (Formerly ALSTOM)
• Siemens Ltd.
• ABB India Ltd.
• Hitachi ABB Power Grid India
• CG Power & Industrial Solution (Formerly CROMPTON GREAVES LTD.)
• BHEL
• PGCIL
• Railway Boards & Various Railway Companies Like
      • Diesel Loco Modernization Works
      • Chittranjan Locomotive Works
      • Benaras Locomotive Works