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MTR: tap in, tap out, distance-based
Hong Kong MTR uses Octopus in and out. Airport Express is a separate fare table. East Rail First Class needs an extra tap. How to use exit letters.
Notes dated 2026-09
Exits are letters and numbers, such as Mong Kok E2. Hotels and maps use these. They beat “east exit”. MTR Mobile lists them.
Lines visitors actually use
- Tsuen Wan line (red): TST–Mong Kok–across the harbour toward Central.
- Island line (blue): Sheung Wan, Central, Causeway Bay, North Point, Shau Kei Wan (bus 9 to Dragon’s Back).
- Kwun Tong / Tuen Ma: Sham Shui Po; Diamond Hill for Sai Kung buses.
- East Rail: Lo Wu, Lok Ma Chau, University, Admiralty. Border line. First Class is a separate tap.
- Airport Express: its own fare table, not a normal MTR ride.
Light Rail (Tuen Mun, Yuen Long)
Street-level trains in the northwest New Territories. Validate on the platform before boarding and when you leave. Sam Shing is useful for Castle Peak Bay. It is not urban MTR; Google sometimes routes you oddly.
Questions
What if I cannot exit for lack of value?
Pay the difference or top up at the customer centre. On-loan cards allow a small negative; sold tourist cards often do not, so you can get stuck.