Union Pacific 4-6-6-4 3985 “Challenger”. From Mark I Video “Close Up 3985” | Dynamo Productions

Union Pacific 4-6-6-4 Challenger 3985. As seen in Mark I Video “Articulateds” program. | Dynamo Productions

Views of Union Pacific's Challenger locomotives with some information on their history with the UP. From the GSVP show "Big Boys and Challengers" https://rfd.video/BBandChallengers | Steam Giants

In our final installment from the Buckeye Limited Convention held at the Mill Creek Central Railroad, you'll see UP Challenger 3977 being loaded onto it's travel cart. You will also see several other locomotives loaded up and many more staged waiting for their turn on the transfer table. | The Steam Channel

It's hard to say how many times Union Pacific Challenger 3985 has made trips across Nebraska, but it's always awesome! From the Railway Productions show "The Challenger Union Pacific’s Legend of Steam" https://rfd.video/Challenger2008 | Steam Giants

Union Pacific Challenger #3985 is seen in Colorado during her 2008 excursions. From the Railway Productions show "The Challenger Union Pacific’s Legend of Steam" https://rfd.video/Challenger2008 | Steam Giants

The 3985 is on her way to ex-Clinchfield territory where she will play Santa on CSXT's Santa Train. From the GSVP show "Challenger Goes East" https://rfd.video/ChallengerEast | Steam Giants

The design, development and arrival of the Challenger locomotives on the Union Pacific. From the Pentrex show "Union Pacific Classic Collectors’ Combo" https://rfd.video/UPCollector | Steam Giants

Union Pacific Challenger number 3977 takes the limelight as her crew lights off her fire and brings her up to operating pressure. We bring you an up close, 1080p HD look at this process and her move through the yard at the Mill Creek Central Railroad right here on The Steam Channel. Enjoy and thanks for watching! | The Steam Channel