A drive train of a motor vehicle, having a drive assembly which has at least one internal combustion engine (1), having a transmission (3) which is connected between the internal combustion engine (1) and an output (2), and having a starter clutch (4) which is connected between the internal combustion engine (1) and the transmission (3), having a bypass transmission (5) which can be connected in parallel with the starter clutch (4) and has at least one transmission stage (6) and an additional clutch (7), wherein in order to reduce the rotational speed of the internal combustion engine (1) in the overrun mode of the drive train the additional clutch (7) is closed and the starter clutch (4) is at least partially opened.