The invention relates to a hydrodynamic 2-speed turbine drive, in particular, turbine drives for application in under-floor or low-floor drive systems on rail vehicles, with two hydrodynamic components for the formation of two tractive-work circuits for two different speed ranges. A first hydrodynamic component is in the form of a hydrodynamic speed/torque converter (3) and a second hydrodynamic component is in the form of a hydrodynamic clutch (4). Drive for the hydrodynamic components is achieved from the drive input shaft (11) by means of a high gear set (14). Coupling of the hydrodynamic components with the drive output shaft (12) is achieved by means of a reverse gear set (22). According to the invention, the hydrodynamic speed/torque converter (3) and the hydrodynamic clutch (4) are arranged parallel to each other and with no, or very little offset when considered in the axial direction between drive input shaft (11) and drive output shaft (12). Furthermore the drive output shaft (12) is arranged above the drive input shaft (11). The reverse gear set (22) is arranged on the side of the clutch (4) and the arrangement of the retarder (35) is achieved without any influence on the arrangement of the drive flange of the drive assembly unit on the side of the speed/torque converter (3).