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This video is a new format that is 80% unscripted in what hopefully is a more interactive format. The video becomes more unscripted and interactive the longer that you watch. Please let me know in the comments below if you like this format better, or the original documentary style I had been using. The video covers the development and history of the Chesapeake and Ohio's Allegheny steam locomotive. The Allegheny is one of the biggest and most powerful locomotives ever built. It also covers the lesser known fact that the Chessie sued Lima Locomotive Works over the weight of the locomotive. And answers the question of who was the heaviest ever built, the Allegheny, or the Union Pacific Big Boy.