Classification yard 1 Classification yards 1 Engines 1 Heuristic methods 1 Integer programming 1 Job resources 1 Job sequencing 1 Locomotives 1 Mixed integer optimization Network node 1 Personnel 1 Quality of service 1 Quality-of-service 1 Railway optimization 1 Railway optimizations 1 Resource allocation 1 Resource scheduling 1 Resource-scheduling 1 Resources allocation 1 Time availability 1 Transport systems 1