Remarks: UP 3985 pulls the Ringling Bros Barnum & Bailey Blue Unit down the Greeley Subdivision this splendid day. How do you celebrate Ringling's 175 years on the railroad? Get the biggest steam locomotive in the world to pull it! Reported to have broken the record IAIS set in 2008 for 21st Century steam. Per UP's website, "History was made Sept. 28, when No. 3985 pulled a 65-car train that was more than 6,000 tons and nearly 6,100 feet long, the most for a steam locomotive in the 21st century." There is a mile-long list of "Thank You's" that could go right here to go with that mile-long train. The Greatest Chase on Earth of the Greatest Show on Earth. We'll be talking about this one for years to come!