This AC4400 has had several numbers during its life span. It started as GECX4000 and was tested on the Union Pacific in UP colors as 1 of 10 units UP tested.. UP then purchased the unit and changed the number to 7000. It later renumbered the unit to 7300. About a year ago, the 10 units regained their numbers from 7000 to 7009 as UP needed room for the new ES44ACs.
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