The article deals with the problem to determine the strength properties of the ballasted clogged sand dunes, including the action vibrodynamic loads. According to the results of laboratory experiments for the first time we obtained the reduction of specific adhesion and angle of internal friction of gravel ballast material on the density and the percentage of blockage of sand dunes under the influence of both static vibrodynamic the action of loads.

Keywords: crushed stone ballast, sand dunes, weed, vibrostabilometr, specific cohesion, internal friction angle

The results of operation of electric locomotives «O'ZBEKISTON». Describes the general characteristics of the railways in Uzbekistan, the basic characteristics of electric series «O'ZBEKISTON». It also presents calculations of generalized reliability indicators and the main directions of development of repair systems.

Keywords: Railways of Uzbekistan, electric locomotives series «UZBEKISTAN», reliability