This paper examines the problem of dividing the large-scale railway network into local control and management areas. Railway network management for the large-scale unified rail system is a very complicated problem. If the rail system owns by the one owner or it is managed by the single unified operator then there exists the problem of network dividing into some separate local railway areas or territorial zones that can be controlled and serviced by the allocated management centers. It's supposed that the railway network has one input and multiple outputs (border stations, ports, remote internal endpoints). At the preliminary stage, the rail network is divided into some sectors (segments) by the number of the main lines. Center of these circular segments will be the network's input. If any main line forms as an offshoot of another main line, then the corresponding sector stands out from the branch node. If the two primary lines join, then the respective sectors or areas also join from the railway junction in whom the joining of two main lines takes place. Trunk lines and other lines crossing two adjacent main lines and their offshoots can be divided into the sectors relating to these main lines in a predetermined proportion. Operating and station tracks' distribution along any main line including its offshoots and other railways describes by the density function. If the density functions of rail tracks along each main line are known, then it is possible to make a pre-decomposition of each main line into local areas so that the length of railway tracks served as well as the length of sections of the main line within the each local area lie within certain pre-defined limits. It is necessary from a practical point of view that the boundary points between local areas would be more accurately defined. To this purpose, the criterion, and the corresponding optimization problem are formulated in the report. Mathematically the problem can be formulated as the minimization of the variance in operational and station tracks' length for all main lines and their all local areas. The analytical solution to this problem is also given.