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In the article presents the network model of processes of planning and the accounting of transportations, and also processes of execution of documentation at freight dispatch in the intra republican message of the railroads of Uzbekistan by means of composite document management. Composite document management provides the movements of documents in paper and in electronic medium, and also their composite decisions. The special the automated system (AS) will support processes of electronic document management and to make the reporting in the automated mode. For mathematical modeling of process of document management in this work it is used methods of network planning and management. It is described characteristics of the offered technology of planning and the accounting of transportations, and also execution of carriage documents at freight dispatch in the intra republican. It is applied, the PERT method for calculation of accidental temporary characteristics of works. Temporary characteristics of events are determined by a method of a critical way. Tables with the sequence of works with the indication of optimistic, probabilistic and pessimistic assessment of duration of performance, and also with results of calculations for determination of average time and dispersion are made. The network schedule of works, in compliance of technology of document management by means of which terms of performance of work are evaluated, entering document management process is made. Durations of critical and noncritical ways are determined. The results received in article confirm efficiency of the offered technology of document management. Use of this technology providing filling of documents electronically and fixing with the digital signature (DS), it is expected to lower expenses of time of consignors and the railroad, to increase productivity of works and quality of the provided services, to create the centralized information base.