Research on optimization of scheduled transit train operating plan

Optimization of the scheduled transit train operating plan is investigated. By using the node partition method, the freight station nodes are transformed into a small-scale sub-network consisting of origin & destination arcs and delay arcs, thus forming a transport network of scheduled transit trains and depicting the whole process of traffic flow explicitly. So optimization of the scheduled transit train operating plan is transformed into design of a network with limitation of conjunct arcs. Taking into consideration the generalized costs of freight transport, the optimization model of the scheduled transit train operating plan is established. The model is a linear integer programming model, which covers the transit plan and makeup plan. The model is solved by Lingo 10.0. The numerical example demonstrates the feasibility of the model and algorithm.