Alstom S.A.; ABB; Bombardier Transportation; CRRC Transportation; Hitachi Ltd.; Kawasaki Heavy Industries; Mitsubishi Heavy Industries; Siemens AG.; Thales Group.; Ansaldo; Beijing Traffic Control Technology; General Electric; China CNR Corporation Ltd
etc.; Incheon Transit Corporation; Intesens; Transmashholding; CalAmp; Hollysys; Deuta; Wabtec Corporation; Ingeteam; Tech Mahindra Ltd; American Equipment Company; Belden Inc.; Bharat Forge Ltd.; CAF
Construcciones y Auxiliar de Ferrocarriles
S.A; Deutsche Bahn AG; Tvema; Wabtec Corporation