Automatic traction coupling, in particular for a goods wagon of a rail vehicle, 1.1 with a coupling head which comprises a coupling head housing and a coupler lock with a locking mechanism, wherein 1.2 the coupler lock is embodied as a turn lock with a coupler lug and a core element, wherein the core element is rotatable about a main axis between a position ready for coupling, a coupled position and an uncoupled position, the coupler lug is connected with a first end (5.1) to the core piece so as to be rotatable about a coupler lug axis and has a second free end (5.2); and 1.3 the core element has a mouth which is arranged for receiving a second end (5.2) of a coupler lug of a diametrically opposed coupling head, and the core element is rotatable counter to the force of a spring mechanism from the coupled position into the uncoupled position and, by means of the force of the spring mechanism, from the uncoupled position into the coupled position; wherein 1.4 the locking mechanism comprises a ram which is displaceable in the coupling direction of the traction coupling counter to a spring force, and a ratchet bar which is displaceable transversely or obliquely with respect to the coupling direction, and 1.5 the ratchet bar is connected to the core element in an articulated manner and is displaceable by the core element, during the rotation thereof from the coupled position into the uncoupled position, into a latching position in which the ratchet bar blocks a rotation of the core element from the uncoupled position into the coupled position; wherein 1.6 the ram, in a first position displaced counter to the spring force, blocks the ratchet bar in the latching position and, in a second position displaced by the spring force, releases the ratchet bar from the latching position, characterized in that 1.7 the latching position of the ratchet bar is positioned in such a manner that the ratchet bar is displaced into the latching position before the core element reaches its uncoupled position. 1.1 with a coupling head which comprises a coupling head housing and a coupler lock with a locking mechanism, wherein 1.2 the coupler lock is embodied as a turn lock with a coupler lug and a core element, wherein the core element is rotatable about a main axis between a position ready for coupling, a coupled position and an uncoupled position, the coupler lug is connected with a first end (5.1) to the core piece so as to be rotatable about a coupler lug axis and has a second free end (5.2); and 1.3 the core element has a mouth which is arranged for receiving a second end (5.2) of a coupler lug of a diametrically opposed coupling head, and the core element is rotatable counter to the force of a spring mechanism from the coupled position into the uncoupled position and, by means of the force of the spring mechanism, from the uncoupled position into the coupled position; wherein 1.4 the locking mechanism comprises a ram which is displaceable in the coupling direction of the traction coupling counter to a spring force, and a ratchet bar which is displaceable transversely or obliquely with respect to the coupling direction, and 1.5 the ratchet bar is connected to the core element in an articulated manner and is displaceable by the core element, during the rotation thereof from the coupled position into the uncoupled position, into a latching position in which the ratchet bar blocks a rotation of the core element from the uncoupled position into the coupled position; wherein 1.6 the ram, in a first position displaced counter to the spring force, blocks the ratchet bar in the latching position and, in a second position displaced by the spring force, releases the ratchet bar from the latching position, characterized in that 1.7 the latching position of the ratchet bar is positioned in such a manner that the ratchet bar is displaced into the latching position before the core element reaches its uncoupled position.