The world's largest steam engine is scheduled to depart Colorado for Wyoming Wednesday morning. Union Pacific's Big Boy No. 4014 will depart from Denver Union Station back to the locomotive's home base in Cheyenne, ending the locomotive's "Heartland of America Tour." Big Boy No. 4014 will depart Denver at 9 a.m. Wednesday, but there is no public access to see the departure. However, the legendary locomotive will make a whistle stop in Greeley on Wednesday from 12:35 p.m. to 1:05 p.m. at the 10th St. Crossing. Union Pacific's fall Big Boy tour began in August and took the locomotive through nine states, including Colorado. The tour also made a whistle stop in Strasburg on Monday. Read more: https://www.9news.com/article/life/style/colorado-guide/big-boy-locomotive-tour-colorado-union-pacific/73-7cfd97dc-0853-4894-af89-a710df64a83c More local videos here: https://bit.ly/2Pa0d1l Subscribe to NEXT: http://bit.ly/2eP1GwI Stay connected: 9NEWS Website: http://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.