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Company: Company guide
 Companies operating in: Training, certification, research |
| Companies operating in: Components |
| Companies operating in: Infrastructure |
| Companies operating in: Mechanical construction |
| Companies operating in: Electrification |
| Companies operating in: Electronic traction |
| Companies operating in: Air conditioning equipment |
| Companies operating in: Auxiliary electric equipment |
| Companies operating in: Auxiliary mechanical equipment |
| Companies operating in: Rolling stock and traction |
| Companies operating in: Brakes |
| Companies operating in: Engineering and consulting |
| Companies operating in: Maintenance |
| Companies operating in: Operators |
| Companies operating in: Others |
| Companies operating in: Signalling |
| Companies operating in: Telecommunication |
| Companies operating in: Track |
| Companies operating in: Business Associations |
| Companies operating in: Isolation |