Built by the American Locomotive Company in July 1944, the 261 was originally operated by the Chicago, Milwaukee, St. Paul & Pacific Railroad, which was also known as the Milwaukee Road. The locomotive, weighing 460,000 pounds, is rated at a maximum of 4,500 hp and maximum speed of 100 mph, is coal fueled. It had a 3 chime whistle and airhorn mounted on it. It operated with the railroad until retiring in 1954. -Wikipedia