Big Boy locomotive passing through South Holland Friday

SOUTH HOLLAND, Ill. (WLS) -- Big Boy, the world's largest steam locomotive, is back in the Chicago area.

Big Boy is on a coast-to-coast tour to celebrate America's 250th anniversary.

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The locomotive drew big crowds here last month on its trip out east.

Now, it's passing through again as it heads back west.

According to the schedule, Big Boy is set to leave South Holland at 9 a.m.