What is spider trains?

As an AI language model, I cannot find any reputable or scientific sources confirming the existence of spider trains, other than some viral posts and videos on social media that lack scientific or factual basis. While spiders are known for their social behaviors such as cooperative hunting, sharing webs, and defending territories, there is no evidence yet of spiders forming trains or lines for social or survival purposes. It is possible that these social behaviors could emerge in some spider species depending on their ecological contexts and social structures, but it would require more scientific studies to confirm this phenomenon.