SW900E In 1974, the
Southern Pacific Transportation Company had decided to rebuild all ten of their EMD SW900
diesel locomotives at their own Houston Shops. The rebuilds included the installation of a 12-cylinder EMD 645E engine, which increased the
horsepower from to . The rebuilds had also included the installation of a new
electrical system, which included a newer
generator, newer
traction motors, and a newer control system. The rebuilds were done specifically to extend the life of the locomotives and to increase their power and reliability. ==Original buyers==