International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

From 2013 to 2015, an “Instrument for the preparation of railway projects on the trans-European transport network” is implemented. The project is funded under Priority Axis 5 “Technical Assistance” of the Operational Program Transport 2007-2014. A total of 11 project preparation lots are being developed. The most important are the projects for the development of Sofia railway junction, Burgas railway junction, reconstruction and modernization of existing stations, preparation of detailed development plans and technical design for new stops and buildings, assessment and verification of compliance with the requirements for interoperability. For the technical design phase, the following projects are being developed: “Modernization of the Sofia – Dragoman railway line”, “Modernization of the Sofia – Pernik – Radomir railway line,” Development of the Sofia railway junction “and” Development of the Burgas railway junction “. Field surveys are conducted to search for archaeological sites within the scope of the projects. The article examines projects in terms of the need for exceptions to Ordinance 55.

Railroad crossings are a point of conflict between rail and road transport. Failure to abide by the rules and their malfunctioning leads to human casualties. The solution is to improve transport infrastructure. In the course of renewal of the railways in the form of rehabilitation, reconstruction, emergency repairs, new construction and more, it is inevitably necessary to intersect road infrastructure. This is done by crossing at one or two levels. During the construction of the main railway lines in Bulgaria, the safety requirements, the load of the road infrastructure, the current speeds, the financial possibilities and other factors led to the construction of many railroad crossings 757 [1]. They are on the secondary and major railway lines, especially outside the large settlements.
Of course, with the construction of new routes, intersections at two levels are envisaged and constructed [2, 3], but at the same time the railroad crossings on the rest of the railway network requiring higher safety criteria have to be maintained. This necessitates the replacement of many elements of the railway and the pavement [4], which in turn leads to a change in the conditions for the reconstruction of the railroad crossings. The report examines a specific case of construction practice – reconstruction of railroad crossings along the second railway line in the area of Iskar Gorge [5], but the conclusions it requires are valid for most existing railroad crossings.