The article addresses the issue of the safety of breaking up and making up of freight trains. The aim of the study is the formation of a technological approach to the use of “barrier groups” of cars on marshalling tracks. For this, methods of analysis and modelling were used. The analysis of methods to prevent exiting of rolling stock beyond limits of the useful length of marshalling tracks is shown. A technology is proposed for the formation of “barrier groups” of cars on marshalling tracks as blocking devices.

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