Fuzzy set in decision support system of locomotive complex information systems

The article proposes the use of Fuzzy Sets theory in decision-making support system of locomotive complex IT-control systems. For this purpose the method of translation linguistic assertions into the language of mathematical logic proposed, which will be introduced on a built-in quality in the IT-control system of monitoring of technical condition and modes of operation of locomotives service company «TMH-Service» and management company «Locomotive technologies».