More than 100 people treated for heat-related injuries at Union Pacific Big Boy event in Pennsylvania

More than 100 people were treated for heat-related injuries Thursday at a Union Pacific Big Boy whistle stop event in Berks County, Pennsylvania, police said. Forty-five of them were taken to the hospital.

Muhlenberg Township Police Department Chief Randall Hoover said one person suffered cardiac arrest but is expected to be OK.

Chopper 3 was over the scene at Muhlenberg Park in Berks County, showing a large EMS presence and a crowd of people.

Medics were seen caring for people who may have been impacted by the heat. Several ambulances were on scene, and tents and cooling buses were seen in the area.

Hoover said they ran out of emergency medical service personnel at the event and had to call in help from neighboring Chester and Montgomery counties.

A large group of people had gathered at the train station to watch the Big Boy historic train roll through the area. 

The train was delayed multiple times because of the heat, leaving many waiting for hours in the blistering sun. Parts of Berks County were seeing 103-degree temperatures and feel-like temps worse than that as the region is in the middle of a dangerous heat wave.

"Scorching hot," said Megan Delp, who is from Reading, Berks County. "It was also an hour and a half late, so we were pretty hot out in the sun out there."

In Pottstown, Mayor Stephanie Henrick said a couple of people also passed out while they were waiting to see the Big Boy train.

Henrick said the town made sure to take extra precautions. But even with the heat, thousands of people attended the event. She added the watch party was huge for the town. 

"It brought so many people to town," Henrick said. "All of our restaurants are packed."

While the Big Boy train is set to be on display at the Philadelphia Navy Yard for the Fourth of July, those who got a chance to see it beforehand say it was well worth it.

"To celebrate our Independence Day is a big thing; this country was built on the railroads," said Jeff Herzong, who is from Reading, Berks County. "We survived on rail roads. It's a neat thing."