The biggest steam locomotive is whistle-stopping across the U.S.

The Union Pacific Railroad's Big Boy No. 4014, the world's largest operating steam locomotive, is touring the U.S. to celebrate the nation's 250th birthday. Crowds have gathered across the country to witness the historic 1.2-million-pound engine in action.
Union Pacific Railroad's Big Boy No. 4014 – the world's largest operating steam locomotive – has been barnstorming from coast-to-coast in a celebration of America's 250 th birthday. Based in Wyoming, the train came east to Philadelphia for the July 4 th weekend.
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