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Factors Determining the Size and Norms for Securing Barrier Wagon Groups

https://doi.org/10.30932/1992-3252-2019-17-242-257

Abstract

Currently, barrier wagon groups are used on the sorting tracks of railway stations as means to prevent rolling stock from moving beyond their useful length to the opposite side from the hump yard. The reasons to use barrier wagon groups are explained by some factors that are present at most Russian railway marshalling stations and comprise elements of longitudinal profile with accelerating grade on the tracks of hump yards, significant length of sets of uncoupled wagons, unfavorable weather and climatic conditions.
Following use of the empirical method for determining the size of barrier wagon groups and cases of traffic safety violation it was necessary to develop a scientifically sound method for determining the need for formation of barrier wagon groups.
The objective of the study is to identify patterns and factors affecting the decision-making on formation of a barrier wagon group on a particular classification track (classification-departure track), as well as on the size and securing of the barrier wagon groups. The research used methods of statistical analysis and mathematical modelling.
The results of the research were reflected in regulatory instruments of the JSC Russian Railways, particularly in the Procedure to determine the size of barrier wagon groups to be placed on the free tracks of classification yards before train disassembling and to calculate the norms for securing barrier wagon groups [1].
The article provides an analysis of the current technology for formation of barrier wagon groups on the tracks of classification and classification & departure yards, as well as the definition of the term of barrier wagon group. A phased model is proposed for determining the need for formation of barrier wagon groups on free classification tracks before train disassembling, as well as of calculation of the size and norms for securing barrier wagon groups. Calculation criteria are established considering the holding capacity of a barrier wagon group and the mass of rolling wagons. Examples of calculations for specific
marshalling stations are given (using examples of JSC Russian Railway).
The main factors influencing the size and norms for securing barrier wagon groups were determined. The dependences of the maximum allowable speed of leaving yard brake position on the average axial load of the wagons in the absence of wind and with a fair wind, as well as of the norms for securing barrier wagon group on the maximum mass of the classified set of wagons and grade rate.
A scientifically based calculation of the required size of the barrier wagon group and the norms of its securing with stop-blocks (brake shoes) will allow to increase traffic safety by preventing the exit of rolling stock outside the track useful length.

For citations:


Kovalenko N.A., Borodin A.A., Tarasov K.A. Factors Determining the Size and Norms for Securing Barrier Wagon Groups. World of Transport and Transportation. 2019;17(6):242-257. https://doi.org/10.30932/1992-3252-2019-17-242-257

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ISSN 1992-3252 (Print)