After evauating alternative measures within a logistics framework, this report recommends two measures of reliability, the maximum percentage of cars whose trip times fall in a consecutive two or three day period of the trip time distribution (the 2- or 3-day%) and the percentage of cars arriving after this period (the %-late). Nevertheless, a dialogue with shippers is necessary before the most appropriate measures can be determined for a specific situation. Using these measures, origin-to-destination (O-D) data for three railroads are analyzed to discover the nature of O-D reliability. Although yard classifications are found to affect reliability much more than does distance, detailed train information is necessary to predict the nature of this impact for a particular O-D pair. Reducing the number of classifications or improving yard operations will improve both reliability and mean trip times.


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    Title :

    Studies in Railroad Operations and Economics. Volume 2. Rail Trip Time Reliability: Evaluation of Performance Measures and Analysis of Trip Time Data


    Contributors:

    Publication date :

    1972


    Size :

    110 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English