Abstract The first section of the narrow-gauge railway line Septemvri-Dobrinishte was put into operation in distant 1926, and last sixth stage it completed 1945. It is single line, non-electrified, with a track gauge 760mm, which makes unique for Bulgaria Balkans. Apart from its gauge, impresses spiral ascents, maximum longitudinal slopes - up to 32 ‰, minimum radii horizontal curves 50m highes...

The electric traction system used in trains is the most energy efficient traction system in the transportation sector. Moreover, it has the least NOx and CO2 emissions in comparison to other transportation systems (e.g. busses, passenger cars, airplanes, etc.). On the other hand, they are extremely expensive, mainly due to high installation and maintenance cost of the catenary system, including...

Stable operation of railway transport is decisive importance in the development country's economy. Railway stations Russian Railways network perform a significant amount work on processing and handling train traffic. Large technical most cases are located at junction railways (railway polygons), where locomotive crews locomotives changes take place as well various types traction (electrified li...

Restructuring of European railway companies has resulted in creating new subjects within railway systems infrastructure managers (IM) on the one hand and railway operators (RO) on the other. In this paper we examine the efficiency and rank different business strategies of railway infrastructure managers using the combined AHP/DEA method. Different strategies include different number of paths al...

In AC electrified railways, there is a significant exchange of power at fundamental and harmonics in quite dynamic conditions. Harmonic patterns rolling stock railway networks are analysed terms active non-active flow, relating it to the characteristic network operating conditions, synthesised current intensity speed. Herein, shown that correlation clustering can separate distortion internal ex...

Power quality and neutral section are two technical problems that hinder the development of electrified railway to high-speed heavy railway. The co-phase power supply technology is one best ways solve these problems. At present, a V type connection traction transformer widely used in frequency single-phase AC system, especially In this paper, new system for based on proposed. One winding as mai...