Abstract：Research purposes: This paper analyzes the existing key problems in the setting of middle switch in technical stations for running 20 000-ton heavy haul freight train and finds out a rational setting of the middle switch of receiving-departure track in technical station, which ensures the operation safety in stations, and it is convenient for station-transport organization.
Research methods: By studying documentation and taking Datong-Qinhuangdao Heavy-haul railway for example, this paper determines the working scope and rational effective length of the receiving-departure track for heavy load train in technical station. Then, this paper finds out the shortages of existing middle switch setting by the combination of qualitative and quantitative methods, and discusses the setting of middle switch of receiving-departure track in technical station in the aspects of safety, convenience for traffic organization and improving the working efficiency in railway station.
Research results: This paper finds out the setting of the middle switch in technical station for receiving and departure of 20 000-ton trains, which can meet the requirements of safe distance and enable train access to the receiving-departure track through the middle switch. In addition, this scheme can both satisfy the technical requirements of receiving and departure of ordinary trains and 10 000-ton trains.
Research Conclusions: The minimum total length of the receiving and departure track for 20 000-ton train in technical station is 3019.24 m; the effective lengths of the segments of the 3 middle switches are 665.24 m, 665.24 m, 665.24 m and 850 m respectively.
2006, Vol. 23 
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