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- United Kingdom:
- City Circle Line, Copenhagen, Denmark
- Circular Line (TRTS), Taipei, Taiwan
- Circular Line (KMRT), Kaohsiung, Taiwan
- Circle MRT Line, Singapore
- Circle Line of Chicago 'L', proposed rapid transit line in Chicago
- Circle line of Moscow Metro
- Ring Rail Line, Finland
- Ring Line (Oslo)
- Line 2, Beijing Subway
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