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- operating activity 2
- operating characteristic 2
- operating characteristics 1
- operating companies 1
- operating compatibility of European railways 1
- operating conditions 5
- operating costs 18
- operating costs elements 2
- operating efficiency 3
- operating expenses 2
- operating experience 2
- operating life 1
- operating mode 2
- operating modes 5
- operating parameters 1
- operating personnel 1
- operating properties 4
- operating repair and maintenance service 2
- operating resource 1
- operating time 2