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"The locomotive is an F59PHI originally built by Electro-Motive Diesel in October 2001. EMD has installed its 710ECO™ Repower upgrade package with the latest microprocessor-controlled locomotive engine technology for lower emissions, increased fuel economy, greater reliability, and predictable maintenance costs. The upgraded locomotive will now achieve EPA Tier 2 emissions performance, two levels cleaner than required for this model, Caltrans said."