The trucking industry is moving towards cleaner, more efficient engines – and the Cummins X15N™ natural gas engine is a big step in that direction. This article explores the X15N’s new features and improvements that were developed based on customer feedback and experiences with the 12-liter ISX12N™, our first natural gas engine designed for use in class 8 trucks. The X15N embodies Cummins’ dedication to innovation and our dedication to customers and their feedback.