Abstract: There is disclosed a locking device for securing a conventional freight cart within a vehicle such as a truck, train or trailer and which locking device includes a hook-like clasp member which is rotatably mounted relative to the vehicle structure, and a locking member that is operative to immobilize the clasp in the locked position thereof. A plurality of locking devices may be conveniently attached to or provided integrally with a side rail of the vehicle at spaced intervals corresponding to the size of the carts to be secured. Simple and quick engagement and disengagement of the locking devices facilitate efficient loading and unloading of the carts.