الفهرس 
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Abstract
One of the most recent approaches which have been used to study the development of railway transportation systems is the computer simulation. The computer simulation is based on placing an actual system by a model which should be compatible with the real one and more convenient for study. This research aims to analyze, compare, evaluate, and apply ifferent computer simulation techniques used for the railway transport systems. A review of railv ay simulation techniques has been introduced. Simulation of railway networks has been dicussed. Different railway simulation software have been analyzed, and compared. RailSys...0.. is a German railway simulation program that deals with this goal. A case study, namely Cairo-Alexandria railway line has been studied. Innovation scenarios have been analyzed and valuated to get the best scenario. The application of the railway simulation system RailSys 3.0 has been applied on Cairo- Alexandria railway line in Egypt, as a case study, in order to study the impact of changing track condition, trains characteristics, and operating system on the line performance measures, the timetable, and the track capacity of the railway transport system. At first, all he infrastructure data, trains’ characteristics and operation components have been entered to the software to construct the simulation model. Secondly, the simulation process has been arried out to construct a graphical model of the case study track including line alignment and trains’ movements as current situation. Finally, eleven innovation scenarios have been suggested, analyzed, evaluated, and compared to the current situation. Each scenario contains a certain operating aspect with a train control technique. Evaluation of the eleven innovation scenarios indicates that the optimum innovation improvement for the case study may be done by updating the locomotives along with maintaining the current carriages to increase the speed of trains, introducing of moving block stem, and improving track condition (scenario 11). The optimum innovation may increase the line commercial speed by 8.93 %, decrease the average trip time for regular trips by 8.81 00. and decrease the average trip time for cut trips by 7.15 %. Also, the suggested improvements may decrease the line delays by 77.68 %, and increase the track capacity by 1....6.4 % for regular trip trains and by 25.35 % for cut trip trains.