Bringing up the tail end of this BNSF Provo-Denver manifest is a BNSF ES44AC and a Norfolk Southern AC44C6M (an NS rebuild from a C44-9W). Norfolk Southern has long been known for conducting rebuilds itself at its Altoona shops rather than contracting out for rebuilds. This is a practice that other Class 1 railroads are starting to embrace to avoid having to buy new, expensive Tier-4 compliant locomotives.
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