Types and Applications of Shortened Crossover in Urban Express Railway
With the rapid development of the operation mode of operating express/slow trains on urban express railway,the sidings of stations is becoming more and more complex.The application of shortened crossing in the distribution design of rail transit wiring is no longer limited to the setting between two turnouts on single crossover,and a new type of shortened crossover of connecting turnouts and circular curves at both ends has emerged.In order to systematically study the design of shortened crossovers,this paper comprehensively summarized the types of shortened crossovers and the calculation formulas of existing research.Based on this,the minimum spacing between parallel tracks that could be used for shortened crossovers,as well as the relationship between the length of parallel track shortened crossovers and the spacing between tracks,were studied.The calculation formulas for shortened crossovers with switches and circular curves connected at both ends were also supplemented.This shortened form could effectively shorten the total length of double island stations,reduce station size,and save engineering investment.Compared with the shortened crossovers between parallel tracks,this shortened form relatively reduced a set of switches,which could improve driving comfort.Therefore,the shortened crossover has high application value in areas where passengers pass through switches such as overtaking lines and station front turn back lines,and can provide reference for optimizing the design of rail transit wiring.
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