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The results of the study the strength characteristics of loess loam under triaxial when exposed vibrodynamic load of high-speed trains. Research carried out on triaxial vibration, based on the principle of operation of the plant simulation vibrodynamic exposure to periodic changes in hydrostatic pressure in the working chamber triaxial. The experimental values of specific cohesion and angle of internal friction, and the values of their relative decline under the influence of vibrodynamic load.

In the article the issues on creation of branch of track width when changing it in the curved track with radius less than 350 m. Presented the existing methods of widening or narrowing the width of the track in the curves section of track. We propose a method of change of gauge in curved track is from 1520 to 1530 or 1535 mm. to the Proposed method of drainage of the track width is carried out by the existing structures of the elements of the superstructure. The proposed method of drainage of the track width gives a smooth fit of the rolling stock in curve track section and provides the requirements of the applicable standards.

The article discusses the issues of using the technology of replacing inventory rails with rail lashes of a jointless track. For the production of works on the replacement of rail lashes, excavators on a combined course have been selected as the leading machines, which in recent years have been widely used in the production of works for the current maintenance and repair of the railway track. The paper presents the results of a comparative assessment of the use of rail lash replacement technology using attachments and using a pair of trolleys. In order to select the best technology for the production of works on the replacement of rail lashes, a methodology for assessing the economic efficiency of using a particular technology has been developed. The main indicator in the calculations were the given operating costs, taking into account the cost of the machine per unit of work, the cost of relocating the machine, the delay of trains, the wages of track fitters and the discharge of rail lashes. According to the results of the calculation, it was found that it is economically advantageous to replace rail lashes at the front of work up to 4 km using technology using a pair of trolleys, at the front of work more than 4 km, it is advisable to replace rail lashes using technology using attachments. The maximum economic effect when using technology with the use of attachments is achieved with a work front of 10 km. A comparison of the results of work on two technologies gives grounds to conclude that with a three-hour «window», the volume of work performed on the technology with the use of attachments is 1,7 times higher than the volume of work performed on the technology with the use of a pair of trolleys.