Why American Freight Trains Are Now 3 Miles Long

You sit at the crossing and count: 40 cars, 80, 120, and the train keeps coming. Some American freight trains now run close to three miles long. Here is why railroads build them that way, how locomotives in the middle of the train make it possible, and how a coupler patented in 1873 and a pipe full of air hold it together and bring it to a stop. 0:00 The train that won't end 0:42 How long is long? 1:55 Why so long? 3:06 Engines in the middle 4:22 The knuckle 5:14 Brakes and FRED 6:47 Stacked two high 7:51 Where it stops fitting 9:19 The longest ever Some footage is representative. No film or photograph of the 2001 BHP record train or the 1977 double-stack prototype exists in this video. The man at the crossing and the locomotive engineer are AI-generated illustrations, not real people. Image credits: "AAR knuckle coupler on MBTA work car", "AAR knuckle coupler connection", "AAR knuckle couplers April 2025", "Eastbound Norfolk Southern intermodal train at Bound Brook July 2026 2", "Rear of CSX train L005 awaiting departure from Framingham October 2025", "CSX intermodal train I022 arriving at Worcester MA June 2025 1" and "2" by 4300streetcar, CC BY 4.0 "Link and pin coupler on Denver & Rio Grande Western Railroad 4914 box car converted to an outfit car 1" by James St. John, CC BY 2.0 "Red Caboose Motel - Casey Jones' Restaurant" by Eli Christman, CC BY 2.0 via Wikimedia Commons. Music: "At Rest" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/b... "Clean Soul" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/b...