A new engine has been designed to meet future requirements for heavy-duty locomotive applications as found in North America and developing countries. After a thorough analysis of future market requirements, a detailed specification was prepared to serve as guideline throughout the evaluation of the design. Objectives were established for many fundamental parameters including efficiency, introductory and growth power ratings, weight and package size, durability, and maintainability. The paper describes the engine configuration, detail design, and the significant use of computer analytical techniques, to provide increased levels of performance in the integrity of the crankshaft, cylinder block, and other key components. In addition, reference to many years’ experience with an existing locomotive engine design has provided assurance of the reliability of many of the new components. Design details are included for many components, with descriptions of the rationale behind those designs.

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