Caterpillar Inc. has said it plans to invest almost $700 million over the next four years to start producing mining shovels and expand production of its trucks at plants in Illinois and India. Peoria, Illinois-based Caterpillar, the world's largest maker of construction and mining equipment, said it plans to add a new mining shovel production line at its Aurora, Illinois plant as well as expanding truck production in Decatur, Illinois and Chennai, India. The new mining shovels will range from 125 ton to 800 ton models.