The term "railroad worm" is often used to describe a bioluminescent insect that is commonly seen on railroad tracks at night, but this species is also known by several other popular names. One of the most common synonyms is "glow worm," which refers to the insect's ability to emit a bright greenish-yellow light from its body. Other names for this creature include "lightning bug," "firefly," and "lampyrid beetle." In fact, there are over 2,000 species of fireflies around the world, each with their unique characteristics and variations in their bioluminescent displays. Regardless of the name, watching these fascinating insects light up the night sky is always a magical experience.