The most important and iconic train line in Tokyo is the JR Yamanote Line. It is a circular "loop" line operated by JR East that encircles the heart of the city, connecting almost all of Tokyo's major hubs, including Shinjuku, Shibuya, Tokyo Station, Ueno, and Akihabara. The line is 34.5 km (21.4 miles) long and consists of 30 stations. You can easily identify the Yamanote trains by their bright green (lime green) color coding. Because it is a loop, there is no "end" of the line; trains run continuously in both clockwise (outer) and counter-clockwise (inner) directions. A full circuit takes about an hour. For tourists, the Yamanote Line is invaluable because it is fully covered by the Japan Rail Pass and provides easy access to the city's most famous districts. It is one of the world's busiest rail lines, with trains arriving every 2 to 4 minutes during peak times. While the Tokyo Metro (subway) handles many "inner" routes, the Yamanote Line serves as the "spine" of Tokyo's transportation, making it the first line most visitors learn to navigate when exploring the Japanese capital.