The invention relates to sanitary technical equipment of railway wagons. The water supply system comprises a water tank with the filling trunks connected to the drain device, sanitary equipment associated with highways water treatment unit. Water treatment unit includes a cold water supply pump, the accumulator and the water heating unit. cold water supply pump connected to a water tank and a pressure accumulator which is connected to water heating unit and sanitary equipment. Backbone supplying hot water to the sanitary equipment is connected to a manifold supplying cold water to the water heating unit. The latter is made of at least two heaters, interconnected conduits with shut-off valves forming circuit reheating water. Water treatment unit may be placed in a separate housing, installed under the carriage. Operation of the system will reduce energy consumption for heating of water before it is supplied to the sanitary equipment, and improve system reliability and simplify its maintenance. 2 bp 11 ZP f ly-3-yl.
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