An abandoned rail line cut east-west through the area north of the campsites—a convenient border that marked the safe zone from the dangerous one. The stories of a phantom train had been around forever, likely spun up and exaggerated through countless retellings around fire pits, the kind low lit with coals and ringed by wide-eyed faces.
Right at the start of your story. But this instantly brings to mind this image.
The classic "horror story around a campfire which will result in all the kids dying" trope in movies 🤣. !PIZZA