WATCH: Big Boy steam locomotive leaves Dallas area

Union Pacific Big Boy leaves Dallas

Union Pacific's Big Boy No. 4014 made a stop at a private Union Pacific Event on Wednesday. 25 "Big Boys" were built during World War II, but only eight survived. No. 4014 is the only one in operation.

DALLAS - The world's largest operating steam locomotive made a stop in the Dallas area this week.

Union Pacific's Big Boy No. 4014 made a stop at a private Union Pacific Event on Wednesday.

Today it left Dallas at 9 a.m. as it made its way to Hearne.

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The train will be back in North Texas next month.

It will be in Fort Worth from October 10 to October 13. The train will be at the Fort Worth T&P Station on W. Lancaster Avenue.

Admission to see the Big Boy is free and open to the public from 9 a.m. to 3 p.m. on Thursday, Oct. 10 and from 9 a.m. to 1 p.m. on Friday, Oct. 11.

The locomotive will leave Fort Worth on Sunday, Oct. 13 at 8 a.m.

The stops are a part of the Big Boy Heartland of America Tour, which takes the train through 10 states.

You can track the engine's current location on Union Pacific's website.

25 "Big Boys" were built during World War II, but only eight survived. No. 4014 is the only one in operation.

Big Boy Heartland of America Tour

Sept. 18-19: Dallas, Texas
Sept. 20-Oct. 3: Locomotive Maintenance
Friday, Oct. 4: Hearne, Texas to Houston, Texas
Oct. 5-Oct. 7: Houston, Texas
Oct. 8-9: Bryan, Texas
Oct. 10-13: Fort Worth, Texas
Oct. 14: McAlester, Oklahoma to Coffeyville, Kansas
Oct. 15: Coffeyville, Kansas to Kansas City, Missouri
Oct. 16-17: Kansas City, Missouri
Oct. 19: Salina, Kansas
Oct. 20: Hays, Kansas to Sharon Springs, Kansas
Oct. 21: Sharon Springs, Kansas to Denver, Colorado
Oct. 22: Denver, Colorado
Oct. 23: Denver, Colorado to Cheyenne, Wyoming