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- operational monitoring 1
- operational personnel 2
- Operational plan 1
- operational plan 4
- operational plan of marshalling yards 1
- operational plan of the marshalling yard 1
- operational plan of work of the switchyard station 2
- operational planning 4
- operational possibilities 1
- operational properties 2
- operational readiness 1
- operational reliability 3
- operational testing 1
- operational tests 2
- operational trials of locomotives 1
- operational turnover 1
- operational work 1
- operations management 1
- operative condition 1
- operative control 1