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The main direction of decrease in operational costs on draft of trains is reduction of expenses by fuel and energy resources, decrease in repair expenses at the expense of increase of indicators of operational reliability of power installations of a diesel rolling stock. It is obvious that the solution of these problems, now when operational profitability of diesels and their reliability are on a limit for the developed service conditions and production of diesel locomotives, it is possible at the expense of application of alternative types of the fuel which use will allow to raise both reliability of a diesel rolling stock, and its profitability under operating conditions. One of such alternative fuels can, is either natural gas, or household oil gas, that is a butane and propane mix in various ratios. In the present article on the basis of mathematical models possible ecological and economic efficiency of use of мix types of fuel on the example of the diesel 2A - 5D49 is shown.