fuji99 said:
Very cool, looks like a type of beetle grub to me.
Yeah, initially I would have said a firefly larvae, but those are much more predatory. They're covered with plates of armor and come equipped with fangs, bringing ruination unto slug colonies.
I Googled some different types of glowworm, and I think this is a railroad work. IIRC, they're also predatory, but they prefer millipedes.