The Union Pacific Big Boy 4014 is chugging along the East Coast to celebrate America's 250th birthday.
It's the largest operating steam locomotive in the world.
RELATED: Big Boy 4014: World's largest operating steam locomotive on tour for America 250
The conductor will say "all aboard" in Jim Thorpe and then make stops in Reading and Pottstown Thursday.
The locomotive will then be on display at the Navy Yard in South Philadelphia on July 4-5.
For the full schedule, visit the Union Pacific website. You can even track Big Boy along its tour online HERE.