The purpose of this article is to improve the methods of rationing the time spent by wagons at the sorting station based on the use of factor expanse. To solve the tasks set, the methods of system and factor analysis, statistical data processing, mathematical logic and factor modeling were used. An analysis of research papers on the topic of research is made and, as a result of the analysis, scientific tasks are established. Random factors influencing the processing of wagons at the sorting station are determined and formulated. An info-logical scheme and a factorial model have been developed on the example of the indicator “the time spent by transit wagons with processing” at the sorting station. The developed factorial models make it possible to study their changes depending on the action of factors, to carry out an accurate assessment of the work of the station staff and to correct the norm for the time spent by wagons.