State and local officials are set to celebrate a milestone for a north Alabama auto engine plant. Gov. Robert Bentley, U.S. senators Jeff Sessions and Richard Shelby and others plan to commemorate the production of the 3-millionth engine at Toyota Motor Manufacturing's plant in Huntsville. The plant produced a record 540,000 engines last year and is the only Toyota plant globally to build four-, six- and eight-cylinder engines. The celebration comes on the heels of an announcement Monday that firearms manufacturer Remington Outdoor Co. plans to expand to Huntsville.