Union Pacific’s No. 4014 steam locomotive is a massive 132-foot long engine that has been touring the rails of middle America since August.

"Big Boy" steam engines were built for the Union Pacific Railroad in 1941. The massive trains traveled across the country until they were retired after two decades of service

The train named Big Boy was late. Anticipation and impatience built as 30 minutes passed. Some had been on the edge of the tracks of Great Overland Station in North Topeka for hours waiting to see a piece of American history pass through town.

To the delight of hundreds of spectators, the famed Big Boy locomotive arrived early Thursday afternoon in North Topeka.The historic train -- billed as the biggest of its kind in the world -- rolled down the Union Pacific tracks and came to a stop around 12:50 p.

Big Boy, the world’s largest operating steam locomotive, is in Texas this week for the Heartland of America Tour. Here's when and where you can see it.

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