We begin with the Union Pacific Challenger, the largest operating steam locomotive in the world. A 4-6-6-4 articulated engine, the Challenger pulls vintage streamlined passenger cars on excursion runs throughout the United States. Next is an informative segment on the various types of railroad signals, many of which are no longer used. Finally, we join the crew of a Chicago SouthShore freight train to see what it's like to work on today's railroad. Also included is an insightful interview from renown railroad artist Mitch Markovitz.