hi Adrian Alba

Hello, Adrian Alba. I heard your name. I moved down the black rail toward a second wagon. Between the two cars sat a small plastic loop and a hook. I pressed my left knuckle against the loop. It resisted slightly, then clicked downward over the hook. A sharp snap traveled up my arm. I gave the brown car a slow tug backward. Both wheeled bodies rolled together along the groove. Two separate units became one line. The connection holds.