Fuel-energy consumption is one of the key factors in choosing the optimal type of locomotives for train operations. The quantity of fuel and energy used for train transportation is significantly influenced by the parameters of wagons and the transported goods. This article recommends an algorithm and an instrumental method in the form of software complexes for calculating the amount of fuel and energy resources used by locomotives of a private transportation company for train transportation under existing conditions, taking into account the planned cargo volume. Based on this, technical and technological solutions have been developed for selecting the planned and rational type of locomotives, considering the parameters of the wagon and the transported goods, the distance of transportation and the characteristics of the railway.