MTR
Except for the Airport Express, MTR fares are slightly lower when using an Octopus card compared to using single journey tickets. For example, the cost of the 3-minute journey from Admiralty to Tsim Sha Tsui across the Victoria Harbour is (as of 2005) HK$7.9 using the Octopus card, compared with HK$9.0 for a single-journey ticket.