Abstract
Since 2010, there has been a strong increase in passenger transport compared to the original forecast. This makes us think about possible ways to improve fixed electric traction installations performance that would enable to increase the transport capacity. To secure modern methods of operation, a quality railroad network with a quality and stable power supply system is necessary. If the existing DC traction system (3 kV) does not ensure sufficient power supply, some other acceptable way must be sought. The problem is technically solvable. If the lines capacity shall be used in the most efficient way, a systematic approach is necessary, in particular using multi-system locomotives with higher performance. Solving the issue of traction power systems development and modernization will be related with the conversion of DC traction system (3kV) into a uniform power supply system (25kV/50Hz).
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