The work included upgrading the prime mover with later GE U33-compatible parts, a complete rewiring of the high- and low-voltage electrical systems, the installation of an AAR control stand and a new number - SP 6800.
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The U25B became a "goodwill ambassador" for the railroad in 1976 when it was painted in an elaborate red, white, and blue color scheme in celebration of the nation's bicentennial, one of four Southern Pacific locomotives so painted.
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