A massive barge piled high with crushed cars was listing in Tacoma’s Commencement Bay on Monday morning, and the Coast Guard said some cars and parts fell into the water. The barge was headed to Schnitzer Steel to deliver the scrap cars but had been docked for several days in the bay. Problems with the barge were reported Sunday afternoon when the 750-foot Canadian barge, owned by Amix, began listing and taking on water, the Coast Guard said.