In Berks County, train enthusiasts and onlookers are struggling with the 100-degree heat while waiting for Big Boy to roll through.

Numerous EMS vehicles are on scene treating a number of apparent heat-related illnesses.

The Union Pacific Big Boy is going full speed ahead to parts of our area, including Berks and Montgomery counties.

Birdsboro cafe hosts party for Union Pacific’s “Big Boy” train arrival

Being the only operational Big Boy, it was rebuilt and put back on the tracks to commemorate America 250.

The train was in Jim Thorpe until 9 a.m. Thursday. 

It was scheduled to make stops through Hamburg, Leesport, and Muhlenberg Township. It was then scheduled to head to Pottstown.

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This is a developing story. We will have the latest update coming at 4:30 and 5:30 p.m. on WFMZ-TV.