FORT WORTH, Texas - The world's largest operating steam locomotive will be in Fort Worth through the weekend. Union Pacific's Big Boy No. 4014 will chug into Fort Worth to be on display Thursday.

The Union Pacific Big Boy No. 4014 is the world's largest operating steam locomotive. It will remain in Cowtown until Sunday, though it will not be on public display after Friday afternoon.

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What used to be more of a festival has become something more interactive, with both the Union Pacific Steam Shop and Roundhouse, where the Big Boy 4014 and other locomotives are housed. At Depot Days, ...

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