Okay kiddo, so one day a long time ago in 1943 in a place called Frankford Junction in Philadelphia, something really bad happened with a train. You know how trains are big and heavy and they go on tracks, right?
Well, two trains crashed into each other on the same track and it caused a lot of damage and people got hurt. The trains were carrying lots of things like heavy metal and gas, which made the crash even worse.
Lots of people were trying to help and fix everything, but it was hard because there were big flames and smoke everywhere. Ambulances came to take the injured people to the hospital.
It was a really scary moment, but the good news is that lots of people worked hard to make sure things got better and nobody gave up until everything was okay again.