Abstract: A coupler head for a (Janney) coupler assembly of a multi-car rail vehicle comprises a coupler head body, a knuckle pin and a knuckle which is rotatable about the knuckle pin relative to the coupler head body between a coupled position and an uncoupled position. A first lock is configured to prevent rotation of the knuckle when the knuckle is in the coupled position. A second lock is configured to prevent rotation of the knuckle when the knuckle is in the uncoupled position. The second lock is further configured to unlock when a predetermined force, which acts on the knuckle so as to rotate the knuckle toward the coupled position, is exceeded, so that the second lock no longer hinders rotation of the knuckle toward the coupled position.