Abstract: A model train coupler for a truck having a pocket with an upright pivot pin, the coupler including a stem inserted endwise into the pocket and swingable on the pin, a laterally opening hook extending outwardly from the stem, an actuator depending from the closed side of the hook, and a guide extending resiliently from the stem partially across the open side of the hook, said hook having an outwardly convergent end portion for entering engagement between the hook and guide of a like coupler to interengage the hooks, and the actuator of a like coupler being engageable with a track cam to spread interengaging hooks laterally apart for uncoupling.