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We discuss a paradox from the field of relativistic thermodynamics: Two heatreservoirs of the same proper temperature move against each other. One is atrest in reference frame SA, the other in reference frame SB. For an observer,no matter in which of the two reference frames he is at rest, the temperaturesof the two reservoirs are different. One might therefore conclude that athermal engine can be operated between the reservoirs. However, the observersin SA and SB do not agree upon the direction of the entropy flow: from SA toSB, or from SB to SA. The resolution of the paradox is obtained by taking intoaccount that the drive of an entropy current is not simply a temperaturedifference, but the difference of a quantity that depends on temperature and onvelocity.

A Relativistic Paradox and its Resolution or Who drives the entropy current between two bodies in relative motion?