Union Pacific Big Boy Battles Wheel Slip at Horseshoe Curve | Steam Giant in Action

Watch the legendary Union Pacific Big Boy take on the famous Horseshoe Curve as the world's largest operating steam locomotive battles the steep grade. This dramatic wheel slip occurred after the Big Boy paused for photos on the curve for the 1,400 railfans gathered at Horseshoe Curve, then backed down the curve before beginning its climb again. It's a rare look at the immense power of the locomotive as it briefly loses traction while pulling its train uphill. If you're a fan of steam locomotives, railfanning, or historic railroad action, this is a moment you won't want to miss and likely will not occur again. Filmed at: Horseshoe Curve, Altoona, Pennsylvania on 7/11/26 If you enjoyed this video, please like, comment, and subscribe for more railroad and steam locomotive content! #BigBoy #UnionPacific #UP4014 #SteamLocomotive #HorseshoeCurve #WheelSlip #Railfan #SteamTrain #Railroad #Altoona #Pennsylvania #TrainVideos