Loop line (railway)

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Loop line has several meanings.

  • A less important line which leaves a main line and then rejoins it later, continuing in the same direction. Significantly longer than a passing loop, its purpose may be purely to provide a bypassing route, or it may provide a goods or passenger service in its own right, such as the Hertford Loop line.
  • A configuration, sometimes known as a balloon loop where trains entering it turn though a half circle and return to the start of the loop facing in the opposite direction from which they came, such as the Sutton Loop.
  • A circle Line is a totally enclosed system whereby trains always remain in the loop, as in the London Underground Circle line.

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