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- open- ended questions 1
- open-top car 3
- open-top wagon 3
- OpenFog 1
- openness of manner and matter 1
- openness of national economy of fuel and energy complex 1
- operability 3
- operating activities 1
- operating activity 2
- operating characteristic 2
- operating characteristics 1
- operating companies 1
- operating compatibility of European railways 1
- operating conditions 5
- operating costs 18
- operating costs elements 2
- operating efficiency 3
- operating expenses 2
- operating experience 2
- operating life 1