SAVANNAH — A director who was working on a movie about singer Gregg Allman testified Monday that his assistants were in charge of location permits and safety precautions when a freight train plowed into his crew on a Georgia railroad bridge, killing a worker and injuring six. He also insisted that Allman, who is suing producers to win back movie rights to his life story, knew about plans to shoot a scene with a bed across the train tracks in the production of "Midnight Rider." "I read the script to him for 4½ hours on a Monday," director Randall Miller testified in a Savannah courtroom.