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- operational suitability constructions 1
- 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
- operative correction 1
- operative correction of the plan of gathering freight trains 1
- operative management 1
- operative plan 2
- operative planning 4
- operative work 1
- operatives 1
- operator 3
- operator companies 2
- operator company 4
- operator differential equation 2