The Natural Evolution of Power. Cummins Westport is the industry leader in producing high-quality economical engines to meet the growing demand for clean power worldwide. Every day. A joint venture between Cummins Inc. and Westport Innovations Inc., Cummins Westport’s mission is to be the world’s leading provider of clean gaseous-fueled engines that deliver the most economical solution for all bus and truck customers. While other engine manufacturers may be new to alternative fuels, Cummins began alternative fuel product development in 1988. Today Cummins Westport Inc. is the undisputed leader in the development and manufacturing of alternative fuel engines for buses, trucks, shuttles and all type of other regional/urban vocational vehicles.