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- operating activities 1
- operating activity 1
- operating characteristic 2
- operating characteristics 1
- operating compatibility of European railways 1
- operating conditions 5
- operating costs 13
- operating costs elements 1
- operating efficiency 2
- operating expenses 2
- operating experience 2
- operating life 1
- operating mode 1
- operating modes 4
- operating parameters 1
- operating personnel 1
- operating properties 1
- operating repair and maintenance service 2
- operating resource 1
- operating time 2