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- operating companies 2
- operating compatibility of European railways 1
- operating conditions 5
- operating costs 25
- operating costs elements 2
- operating depot 1
- operating efficiency 2
- operating expenses 2
- operating experience 2
- operating life 1
- operating mode 3
- operating modes 8
- operating parameters 1
- operating personnel 1
- operating properties 4
- operating repair and maintenance service 2
- operating resource 1
- operating signals 1
- operating technology 2
- operating time 3