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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 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.

It is offered the technique for the assessment of the efficiency of the application of the mixed hydrocarbonic kinds of fuel in the power installations of diesel locomotives. The model calculations have been executed with a glance of the changing of the physicochemical and thermalphysic characteristics of the fuel mixtures and the service conditions of diesel locomotives.