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- operation modes 2
- operation modules 1
- operation of business 1
- operation of the track circuit 1
- operation parameters 1
- operation rate coefficient 1
- operation security 2
- operation technology 2
- operational 1
- operational and technological communication 1
- operational characteristics 2
- operational control 1
- operational costs 4
- operational efficiency 5
- operational expenditure - savings 1
- operational management 6
- operational monitoring 1
- operational personnel 2
- Operational plan 1
- operational plan 4