In a rail vehicle, a converter circuit comprises a housing 56 for enclosing a fluid in which housing at least a part 52, 54 of a charging unit 50 for charging an energy storage of the converter circuit is accommodated. The housing 56 comprises a fluid 58 for cooling and/or isolating the part 52, 54 of the charging unit 50. A transformer 28 or generally an inductor 28 may be accommodated in the housing 56.
