by ColoradoRailfan » Fri Jun 19, 2015 5:19 pm
That is a Tier 4 GEVO, that picture was posted a few months ago, Several Class I railroads will be receiving the Tier 4 model beginning in 2015, including Canadian National Railway, CSX Transportation, and Union Pacific. BNSF Railway will receive Tier 4-compliant ES44C4's. Union Pacific refers to them as EF44AC"s, the "F" stands for "Four", as in "Tier 4"; it is also referred to as ET44AC
Moffat Tunnel W.I.P