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- operation of the track circuit 1
- operation parameters 1
- operation rate coefficient 1
- operation security 2
- operational 1
- operational characteristics 1
- operational control 1
- operational costs 4
- operational efficiency 3
- operational expenditure - savings 1
- operational management 5
- 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