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A frog war occurs when one private railway company attempts to cross the tracks of another, and this results in hostilities between the two railways. It is named after the frog, the piece of track that allows the two tracks to join or cross and is usually part of a level junction or railroad switch.
A frog war usually begins with legal actions, such as filing lawsuits and appealing to civic transportation authorities. But often the situation escalates into physical actions, with companies pitting their workers against one another with construction projects and train movements intended to frustrate or challenge the opposing railway.