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Union Pacific No. 4014 "Big Boy" Steam Locomotive
The world's largest operational steam locomotive rolling through Leetsdale, Pennsylvania on the historic Fort Wayne Line.
Footage Attribution & Permissions
Original Footage & Video: Courtesy of Mark R. (Recorded August 21, 2026)
Location: Norfolk Southern Fort Wayne Line (Leetsdale, Pennsylvania)
Licensing & Permission Notice: This video is featured on WordGeek™ Media with express individual authorization and permission confirmed on August 21, 2026. All original copyright and footage rights are strictly retained by the creator. WordGeek claims no ownership of this footage.
The Legend of Big Boy No. 4014
There are machines built for function, and then there are machines that become something more — something people travel hundreds of miles just to stand next to. The Union Pacific "Big Boy" is both. Built in 1941 by the American Locomotive Company (ALCO), the 4000-class locomotives were purpose-engineered to haul heavy freight over the brutal Wasatch mountain grades between Ogden, Utah and Green River, Wyoming. With a 4-8-8-4 articulated wheel arrangement, a length of 132 feet, and a loaded weight of over 1.2 million pounds, they were not just the largest steam locomotives ever built — they were the largest reciprocating steam engines ever put on rails, anywhere, by anyone.
The name "Big Boy" was never officially assigned by Union Pacific. According to railroad lore, a worker in ALCO's Schenectady, New York erecting shop chalked the words on the front of the locomotive during assembly, and the name stuck. Union Pacific eventually embraced it. Twenty-five of them were built in two production runs — in 1941 and again in 1944 — and together they became synonymous with the raw, unrelenting power of American industry at its peak. By the late 1950s, diesel power had made them economically obsolete, and the last Big Boy turned its wheels in revenue service in 1959.
Of the eight surviving Big Boys preserved in museums across the country, only one ever ran again. Union Pacific No. 4014 had been on static display at the RailGiants Museum in Pomona, California since 1961. In 2013, Union Pacific reacquired it and began a painstaking, years-long restoration at their Cheyenne, Wyoming steam shop. On May 4, 2019 — exactly 150 years after the driving of the Golden Spike at Promontory Summit — No. 4014 returned to steam and completed a commemorative tour across the western United States. It was a moment railfans had waited sixty years for.
What you are watching in this footage is No. 4014 on its 2026 tour, captured on August 21st along the Norfolk Southern Fort Wayne Line at Leetsdale, Pennsylvania — just upriver from Pittsburgh along the Ohio River corridor. The locomotive is heading westbound, making its way back home toward Utah and Wyoming after completing the eastern leg of its journey. The Fort Wayne Line is one of the great freight arteries of the eastern United States, and watching something this large, this old, and this loud move under its own steam along it is, by any measure, a rare thing.
Credit and sincere thanks go to Mark R., who was there on the right day at the right place and had the presence of mind to capture it. Footage like this doesn't happen by accident — it takes patience, knowledge of the schedule, and the willingness to stand trackside and wait. This clip is featured on WordGeek Media with his express permission, and all original rights remain entirely with him. We are grateful he let us share it.