The JR Yamanote line, operated by JR East, is probably the most popular and convenient way for getting around Tokyo.
At 34,5 km (21,44 miles) long, this is the only line that connects all of Tokyo’s most famous central stations. It’s also known as the Tokyo green line because of the color of its trains and the green color used to outline its route on maps.
JR Pass holders can take advantage of this loop service for free. Taking any train on the Yamanote line is fully included in the JR Pass.