Line 4 is a loop line of the Shanghai Metro network. Its rolling stock carry a bright violet colour belt to differentiate them from Line 3 trains which share a portion of its track. To determine the direction of travel the line that travels counter-clockwise is called the Outer Loop (外环) while the other line is known as the Inner Loop (内环). Although it is a loop line trains returning to the depot use Yishan Road as a terminal to let all passengers disembark.
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