Siemens Charger SC44 Bo-Bo diesel-electric No 2121 arrives at San Diego Santa Fe Depot with a southbound Coaster from Los Angeles. These Siemens power units were introduced from 2017 replacing the much older F59PHi units on the California Coaster route. California's SC-44s have aerodynamic "spoilers" on the rear of their roofs that match the height of bi-level California and Surfliner cars.
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