Cummins designs and manufactures diesel and natural gas engines, along with power generation equipment and components, used in trucks, construction equipment, agricultural machinery and backup power systems. Its engines power vehicles and equipment made by many different manufacturers rather than a single captive customer, giving Cummins a broad customer base across the trucking and industrial equipment industries. The company has been investing in alternative powertrains, including natural gas engines, hydrogen fuel cells and battery-electric systems, as emissions regulations tighten and some customers look to reduce their reliance on diesel. Demand for Cummins' engines tracks truck and construction equipment production cycles closely, so its results tend to rise and fall with broader industrial and freight activity.