Finally - a definitive answer as to what is at the end of the rainbow, and it isn't a pot of gold. It's a SEPTA AEM-7 running out its final miles before being replaced by the new ACS-64 fleet. Here, SEPTA train #6374 departs Langhorne, PA shortly after a strong summer thunderstorm drenched the area, bringing out a rainbow in the sky behind the train.
