Train cars full of human waste have been sitting in Parrish, Ala., since February. “It’s so frustrating,” the town’s mayor said.

Train cars full of human waste have been sitting in Parrish, Ala., since February. "It's so frustrating," the town's mayor said.

Train cars full of human waste have been sitting in Parrish, Ala., since February. “It’s so frustrating,” the town’s mayor said.

Train cars full of human waste have been sitting in Parrish, Ala., since February. “It’s so frustrating,” the town’s mayor said.