It is a sight to see if you get a chance. I've posted about it before. Archive: https://archive.today/DzktV From the post: >>The world's largest steam engine is coming back to Colorado. Union Pacific will bring Big Boy No. 4014 through Colorado from Monday, Oct. 21, to Wednesday, Oct. 23, on its "Heartland of America Tour." The fall tour, which began in August, has the famed locomotive traveling from its open in Cheyenne, Wyoming, through nine states, including Colorado. The tour will make two whistle stops in Colorado, but the locomotive will not make longer public visits.