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- operation 25
- operation conditions 1
- operation cost 1
- operation costs 1
- operation efficiency 3
- operation life 1
- operation management 1
- operation modes 2
- operation of business 1
- 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