Service accessibility can be used to describe the travel time of passengers between different nodes, and the opportunities to get transportation services in the high-speed railway (HSR) system. Based on the traditional train line planning theory, this paper introduces the transportation service accessibility index, and proposes a new passenger train line planning model, which aims to maximize the service accessibility as well as minimize the operational cost of railway company. The model is transformed into a single-objective nonlinear model, and then we design a Harmony Search algorithm to solve it. Finally, the model is validated by a numerical example. The results of this model as well as the scenarios of the single-objective models for minimizing operational costs and maximizing service accessibility are compared. From the perspective of the number of train services and its frequency, the service frequency and accessibility of each node, we know that the proposed method can balance the conflicts between the average speed between large nodes and the service frequency of small and medium size modes in the HSR network.

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