Big Boy 2024 Schedule 2024 Map. 4014, the world's largest steam locomotive, will return to the rails in 2024 for a tour celebrating the railroad's deep history and connection to. The ‘heartland of america tour’ will be big boy’s second tour of 2024.

— union pacific will send big boy no. Omaha, neb., june 17, 2024 union pacific announced today that its legendary steam locomotive big boy no.