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The Tokyo subway æ±äº¬ã®åœ°ä¸‹é‰„ TÅkyÅ no chikatetsu is a part of the extensive rapid transit system that consists of Tokyo Metro and Toei Subway in the Greater Tokyo area of Japan. While the subway system itself is largely within the city center, the lines extend far out via extensive through services onto suburban railway lines. There are two primary subway operators in Tokyo: Tokyo Metro – Formerly the Teito Rapid Transit Authority TRTA, it was privatized in 2004. It currently operates 179 stations on nine lines and 195.1 kilometers 121.2 mi of route. Toei Subway – run by the Tokyo Metropolitan Bureau of Transportation, an agency of the Tokyo Metropolitan Government. It operates 99 stations on four lines and 109.0 kilometers 67.7 mi of route. As of 2015, the combined subway network of the Tokyo and Toei metros comprises 278 stations and 13 lines covering a total system length of 304.1 kilometers 189.0 mi. The Tokyo Metro and Toei networks together carry a combined average of over eight million passengers daily. Despite being ranked first in worldwide subway usage, subways make up a small fraction of heavy rail rapid transit in Tokyo alone—only 274 out of 882 railway stations, as of 2007. The Tokyo subway at 8.7 million daily passengers only represents 22% of Tokyo`s 40 million daily rail passengers see Transport in Greater Tokyo.