Optimization for Train Schedules of Full-length a Short-turn Routing Mode in Urban Rail Transit

The train schedule is the basis of operation organization in urban rail transit.According to the properties of the full-length & short-turn routing mode in urban railway transit, a multi-objective nonlinear mixed integer programming optimization model of train shedule for a single transit line is established.The objective functions are minimum passenger travel cost, enterprise operation cost and maximum passenger service level.The constraints of model are set as the shortest headway time interval of consecutive trains, passenger demand and the maximal available electric multiple units.Matlab software can be used to figure out the solution to the multi -objective model based on TOPSIS which can convert the above model into the single objective model.The validity of the model is verified by a case, and positions of turn-back stations are also analyzed.The results indicate that full-length & short-turn routing mode is better; the shorter length of short -turn routing is not conducive to the passengers, and it cannot lead to a more saving of Operator's cost as well.a s ), open the short-turn train.For