Cummins Inc. Cummins Inc. is a leading worldwide designer and manufacturer  of diesel engines from 55 to 3,500 horsepower and the worldGLYPH<213>s largest producer of commercial diesel engines above 50 horsepower.  The company provides products and services for customers in markets worldwide for engines, power generation and filtration, including engine components, natural gas engines, filtration systems and information products and services. In 2000, Cummins reported sales of $6.6 billion and employed 28,000 people.