A motor vehicle driving train includes a propulsion engine (2) designed as an internal combustion engine, a gearbox (4) with variable transmission ratio linked to an axle drive (5), and an automated engine clutch (3) arranged between the propulsion engine (2) and the gearbox (4) so as to transmit power, and designed as a friction clutch which can be passively closed by a spring-supported compression device (6), and whose transmissible torque (clutch moment) can be adjusted by means of a clutch actuator (7). In order to improve controllability and produce a faster response characteristic of the engine clutch (3), the spring-supported compression device (6) is designed to generate a basic clutch moment lower than the maximum torque of the propulsion engine (2), and a second compression device (17) operationally linked to the clutch actuator (7) is provided for setting a higher clutch moment.