'Big Boy' is making a rare multi-state trip to the East, starting in May. The steam engine is 133 feet long and weighs 1.2 million pounds.
The world's largest steam train is heading east across the Mississippi River to help celebrate America's 250th birthday.
The train, officially known as Big Boy No. 4014, is making a 10-state swing starting in late May. Delivered to Union Pacific in 1... [1761 chars]