SD70

The EMD SD70 is a family of diesel-electric locomotives built by Electro-Motive Diesel (EMD) since 1993. It is a significant model in modern locomotive design, evolving from earlier EMD offerings. The SD70 series is characterized by its AC traction motors and a high horsepower rating, making it suitable for heavy freight service. Various sub-models exist within the SD70 family, each with specific technological advancements and configurations.

Key features of the SD70 include its powerful engine, typically a 16-710 series prime mover, and its sophisticated AC traction system. This system provides improved adhesion, better performance on gradients, and reduced maintenance compared to older DC systems. The locomotives are designed for reliability and efficiency in demanding railroad operations.

The SD70 has been produced in several iterations, such as the SD70MAC, SD70M, SD70ACe, and SD70AH. These variations often reflect updates in emissions standards, control systems, and specific customer requirements. The SD70 series is widely used by major North American railroads and has also been exported to other countries. Its widespread adoption highlights its effectiveness as a modern, high-performance freight locomotive.