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After the UP MP merger in 1982, the Union Pacific moved some of the MP GP38s to the Los Angeles area to handle local work. You can tell that the Missouri Pacific had little concern for running these units over mountain grades - note the lack of dynamic brakes. On December 16, 1985 engine 2015 lays over in Colton while engines 2009 and 2039 take a block of interchange cars from Colton up to San Bernardino. Disk 53