The invention relates to a prime mover arrangement comprising an internal combustion engine (1) for driving a first shaft (2) and comprising a steam engine (4) which is connected to the first shaft by means of a clutch arrangement (3) for driving a second shaft (5). Furthermore, means which interact with the clutch arrangement (3) are arranged between the first shaft (2) and the second shaft (5) in order to transmit a rotational movement of the second shaft (5) to the first shaft (2) in a first operating mode and to allow a freewheel between the first shaft (2) and the second shaft (5) in a second operating mode. The clutch arrangement (3) can be operated with positive pressure or negative pressure. Furthermore, the clutch arrangement (3) can be shifted by a fluid, and a torque transmission is provided between the first shaft (2) and the second shaft (5).
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