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In article there are fluid flow mathematical models at the UV-sterilizer with concentric pipes installed in modernized water supply system of passenger car allowing to determine the velocity field of the rotational velocity component and assess the degree of attenuation depending on the chamber disinfection geometry, the inlet pressure in the water system, and fluid properties. There are exact solutions of the Navier-Stokes equations for a rotating fluid between fixed cylinder of infinite length and limited fictitious determined rotating lids provided Poiseuille axisymmetric flow. The decision explicitly contains the product of cylindrical Bessel functions and hyperbolic functions.

The article considers the existing methods for solving problems to improve the purification of compressed air in the brake system of the rolling stock. Presents the disadvantages of these methods and proposed a fundamentally new method of purification of compressed air, not previously used on rolling stock.

The article considers the urgency of the problem of creating an on-board system of diagnosing the technical condition of railway car, the shortcomings of the existing diagnostic tools are indicated. Patent search of electric power sources for freight wagons has been carried out, their features have been determined. The author's design of the power supply device is proposed to diagnose the technical condition of railway car on the trip.