National

    • Indian Railways
      Govt. of India
    • Delhi Metro Rail Corporation Ltd.
    • Kolkata Metro Rail Corporation Ltd.
      BEML Limited, Ministry of Defence, Govt. of India
    • Hindustan Aeronautics Ltd.
      Ministry of Defence, Govt. of India
    • Defence Research and Development Organisation (DRDO)
      Ministry of Defence, Govt. of India
    • BEML Limited 
      Ministry of Defence, Govt. of India
    • Indian Air Force, Ministry of Defence
      Govt. of India
    • Bharat Heavy Electricals Ltd.
      Govt. of India
    • Bharat Electronics Limited 
      Ministry of Defence, Govt. of India

International

    • Bombardier Transportation
      Switzerland
    • Thales
      France
    • Suomen Vaimenin Oy
      Finland
    • Info-Tek Corporation 
      Taiwan
    • AH Industries
      Israel
    • Barco
      China