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The results of the investigations on the evaluation of efficiency use of the diesel locomotives UzTE16M4 in the mountainous direction Kumkurgan - Tashguzar of the Uzbek railways track by of the movement goods trains with stops and without any stops on the spaces station are presented.

The introduced results of the investigation by valuation of efficiency the employment of the locomotives of the diesel (the diesel locomotives 3TE10M, UzTE16M3) and of the electrical (the electric locomotives 3VL80S) tractions in the plainly direction of railway track by the method of averagin design values. Modified average significances main indicator move working of the investigations of the diesel locomotives 3TE10M, UzTE16M3 of the evaluation mind numeral and table facts, and also graphic arts dependences, representative oneself arithmetical mean value with taking into account of the movement goods trains without any stops and with stops on the spaces stations, passing - tracks and divides points, which have received in the result to uses of the traction calculation for different conditions organization of the goods movement. Designate equations for organization calculation values mention exponents in the accepted range changing of the masses trains

The results of the investigations on the study condition movement of high-speed trains with active and passive systems inclination of body of the carriage in the curved directions of railway track with the registrations of the organizes in the movement and exploitation of the electric trains «Afrosiyob» in the direction Tashkent - Samarkand of the Uzbek railway track are presented are presented.

Currently operating on the network of Russian Railways passenger electric locomotives, while driving trains on different difficulty stages, not equally utilize the available capacity and work with different energy performance. The purpose of the work is to consider the energy efficiency of passenger electric locomotives when driving trains on certain sections of Railways and to determine ways to improve their energy performance. To achieve this goal, the work of passenger locomotives EP1 and EP2K on the sections of the mid-Siberian railway was analyzed, the average mass of passenger trains and their speed were determined, the values of the power realized by electric locomotives in operation were calculated, as well as the rational values of the power and mass of locomotives needed for driving passenger trains on the considered sections of the track, and a comparative assessment of the possible operation of electric locomotives with rational values of power and mass with the operated locomotives EP1 and EP2K. On the basis of the comparative analysis, the conclusion is made about the available reserves for increasing the energy indicators of passenger electric locomotives in certain sections of the Russian Railways, such as the operation of locomotives with rational values of power and mass required to provide modern passenger transportation, and the method of determining the energy efficiency of electric locomotives, which allows without calculating the traction and energy characteristics to estimate the cost of electricity for traction of trains.

The article considers the processes of current collection in the system of AC electric traction in high-speed traffic. The existing devices of pantograph and catenary interacting by means of a sliding electrical contact are presented. The comparison of solutions with different horizontal geometry of the contact wire, which affects the speed of the lateral displacement of the contact wire at the catenary supports relative to the axis of the railway track, is given. It is shown that the speed at which the contact point moves along the pantograph strip is also important for assessing the wear of the sliding contact, as is the span length of the catenary supports, the curvature of the track and the speed of the train in the span limits. For the synthesis and analysis of the pair "pantograph strip - contact wire" with a sliding contact, a model for calculating the contact surface is obtained and the energy processes leading to wear of the components of the current collection system are considered. The results of modeling the interaction of the pantograph and the catenary with various variants of the zigzag arrangement of the contact wire are obtained. When implementing a technical solution in areas with high-speed traffic, the preferred method proposed in the article is the arrangement of the contact wire of a chain suspension with a zigzag period increased by two times compared to the traditional one. This solution provides a reduction in the speed of lateral displacement and increases the dynamic stability of the pantograph, reduces the cyclic load on the supporting and supporting structures of the catenary and increases the life of the contacting elements of the current collection system during high-speed traffic.