Union Pacific Challenger on the move By Angela Cotey | August 8, 2017 | Last updated on January 4, 2021 Get our weekly newsletter delivered to your inbox Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Union Pacific’s roving goodwill ambassador, 4-6-6-4 No. 3985, rolls through Cole Junction, Mo., while pulling the Missouri River Eagle special west of Jefferson City, Mo., on Oct 4, 2010. Peter N. Davis photo Share this article Print Facebook