Abstract: In order to alleviate the increasingly tight problem of locomotives-trains connection in marshalling station and reduce the stopover time of locomotives and vehicles, on the basis of explaining the current situation of locomotive-train connection in marshalling yard, this paper analyzed the reasons for the lack of close connection, and proposed the solution of drawing up the stage plan of locomotive operation. Through the construction of locomotive information sharing mechanism to implement information transparency, the article analyzed the locomotive operation rules, built a locomotive operation stage planning model, and verified the model by an example. The validation results show that the scheme can alleviate the problem of locomotive-train connection to a certain extent.