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编组站是铁路技术作业的基层生产单位，在车流组织中起着关键作用。由于编组站建设或改造投资巨大，因此有必要对其站型选择进行慎重考虑。实际运转作业中，单向系统与双向系统各有优缺点，同时，编组站的布置还要受到很多技术因素的制约，因而，仅仅依靠简单的定性对比分析来确定站型显然是不切实际的，要解决这一问题必须进行定量比对研究，构建站型选择的量化标准。基于以上分析，本文首先着眼于确定单双向系统选择的技术条件，并以此为基础，定量研究反向改编列车对单向系统及折角车流对双向系统各自的影响，从车流结构角度得出影响选择的技术因素。在上述研究基础上，以单向三级三场和双向三级六场为代表，构建能力约束条件下的典型单双向系统的择优比对模型，并通过徐州北编组站进行实例验证，从中看出，从车流结构入手，根据各种车流在编组站所消耗总费用的高低来进行站型选择不仅切实有效，而且经济科学，同时，这也为全面定位编组站的规模和布局提供了一种科学有效的决策手段。

Comparative Study on Optimal Type Selection of Marshalling Station Between Unidirectional and Bidirectional

Marshalling station is a fundamental unit of railway technical operation,and plays a key role in wagon flow organization.This paper first puts forward technical items in type selection,and then makes quantitative study of the influence of reversing trains on unidirectional Marshalling stations and angular traffic flow in bidirectional Marshalling station respectively,from which some relative technique factors are acquired in the aspect of wagon flow structure.Afterwards,this paper presents typical station type selecting model by taking unidirectional three-stage/three-yard Marshalling station and bidirectional three-stage/six-yard Marshalling station as representation.At last,the experiment to demonstrate the effect of the method is conducted on Northern Xuzhou Marshalling Station proves that station type selecting by means of comparing the total waste of wagon flow in the Marshalling station from the view of wagon flow structure is not only effective but scientific and it provides a scientific and effective decision-making measure for determining the scope and layout of Marshalling station.