Metra is a service mark that stands for "Metropolitan Rail." It is the primary commuter rail system serving the Chicago metropolitan area and its surrounding suburbs. Formed in 1984 as the "Commuter Rail Division" of the Regional Transportation Authority (RTA), the name was adopted in 1985 to provide a unified identity for a patchwork of rail lines that were previously operated by various private freight companies. In 2026, Metra remains the fourth busiest commuter rail system in the United States, operating 11 distinct lines with nearly 250 stations. While the name sounds like a formal acronym, it was specifically chosen to be a "service mark" that implies a high-speed, modern, and interconnected metropolitan transit network. It effectively rebranded the various lines (like the Union Pacific and BNSF routes) into a single, cohesive public utility for the millions of residents in northeast Illinois.