The piece I'm talking about is the EZcoupler on the front of the front car or engine.

Do you sell replacement hooks or how do I take the hook of the front car that doesn't need one on the front.  I have the Oklahoma Sooners train and one of the middle cars connecting hook broke in packaging.  The front I guess engine does not need one on the front but I can't see how to take it off, it doesn't have a screw on it like the other cars.