- ThyssenKrupp – procurement of material for railway and tramway lines
- Vossloh Cogifer - procurement of material for railway lines
- Voestalpine - procurement of material for railway lines
- Siemens – procurement of electronic equipment for railway and tramway lines
- OHL – co-operation in construction projects
- Strabag – co-operation in construction projects
- Bilfinger – co-operation in construction projects
- Skanska – co-operation in construction projects