A humpbacked prototype. Built as an ET44AC prototype, GECX 2039 sports a humpbacked profile not found on production models of the ET44AC. It is seen stopped at Coteau as CN 372 works the ya... (more)

233 Exits Tunnel 3, Westbound on the single track at Stepptown, with GECX 2039, one of the Tier 4 Demonstrator units leading.

With their work completed at Mattoon Yard, A431 departs on the final leg of its journey from Memphis, Tenn., to Decatur, Ill. A pair of Tier 4 GE demonstrator units lead on May 22, 2015.