CHEYENNE, WY — The world's largest steam locomotive is preparing to take to the tracks once again.

Union Pacific has announced Big Boy No. 4014 will begin a trek across the central U.S. on Thursday, Aug. 5. The trip, dubbed "The Big Boy 2021 Tour" will take the train through Nebraska, Colorado, Wyoming, Kansas, Missouri, Oklahoma, Texas, Illinois and Arkansas.

According to a map of the route from Union Pacific, Nebraska town's included along the route are Sidney, North Platte and Fairbury.

The locomotive will stop for full days to be on display in the following cities:

Fort Worth, Texas - Saturday, Aug. 14

Houston, Texas - Tuesday, Aug. 17

New Orleans, Louisiana - Saturday, Aug. 21

St. Louis, Missouri - Sunday, Aug. 29

Denver, Colorado - Monday, Sept. 6

Union Pacific says Big Boy will also be making whistle and overnight stops in other cities, but those have not yet been finalized.

No. 4014 is the only remaining operating Big Boy of the 25 that were built for Union Pacific in the 1940s. Eight still exist. The other seven are on display in Cheyenne, Wyo., Omaha, Neb., Denver, Colo., Frisco, Texas, Green Bay, Wisc., Scranton, Pa., and St. Louis, Mo.

See the full route of "The Big Boy 2021 Tour" below:

Union Pacific