CINCINNATI, Ohio – Railfans along CSX Transportation’s Cincinnati to Nashville, Tenn., rail lines may have caught a glimpse of new Electro-Motive Division SD70ACe Tier 4 demonstrators early this week. EMDX SD70ACe T4s Nos. 1609 and 1610 are testing along the Louisville Division on CSX freight trains Nos. Q573/Q574 between Queensgate Yard in Cincinnati and Nashville.

The two locomotives are sporting Union Pacific colors, but Electro Motive demonstrator logos and decals. The two back-to-back Tier 4 locomotives are expected to stay in captive service on CSX for a few weeks, sources say.

It is the first time CSX has tested EMD locomotives since EMDX SD70ACe demonstrators in 2013.