A system and method for securing the connection between carts that are configured to connect to each other to form a train of carts, as well as for securing the connection between a cart and a tugger that tows the carts. The system and method involves providing a spring biased blocking plate that is positioned above the boss of the drawbar when the drawbar is engaged with a hitch plate. The blocking plate limits vertical movement of the drawbar thereby preventing inadvertent disconnection of the drawbar from the hitch plate.