JSC Serbian Railways
- Ministry of Construction, Transport and Infrastructure of Serbia
- JSC „Serbian Raillways“
- JSC ” Infrastructure Serbian Railways”
- JSC “Srbija Voz “
- JSC “Srbija Kargo”
- “RZD International” LLC – Russian Railways Company
- Institute “Mihajlo Pupin”
- SIEMENS
- SMART CORPORATION – Slovakia
- ТHALES GROUP – Austria
- ITALIANA COSTRUZIONI BALCANI
- ATM BG
- MBA Ratko Mitrovic – Civil Engineering
- Institute for Health Care of Railway Workers
- Railway Integral Transport
- JSC ZGOP Novi Sad, Enterprise for Construction and Maintenance of Railway Lines
- Cooperative Union of Serbia
- Dunav Insurance Company
- „Alfa BK“ University
- RMT Group
