Originally Posted by
Steve M
Bonus question: Let's say you do In-City Check-In at Kowloon Station and use an Octopus to pay for the Airport Express. It will charge you the AE fare for Kowloon at that point, even though you may not get on the train (you have 24 hours to go through the train turnstiles and have that trip covered by the charge made during in-city check-in). Within 24 hours, you go through the AE train turnstiles at Hong Kong Station. Is it smart enough to charge your Octopus just the difference in fare between Kowloon and Hong Kong trips to the airport? Or do you get away with not paying the extra fare? Or does it not link up your previous fare payment at Kowloon and charge you a full fare?
To be honest, I don't know how this will work "IT wise",but MTR staff in HK are extremely efficient,so if you approach them in HK station after the platform gate rejects your card (due to low balance),they will be able to cancel the original transaction (90HKD) and charge you again (100HKD).
If you had enough balance on your card and were charged 100+90,then again you can approach MTR staff in the airport and they will cancel and refund your 90HKD charge.
The easiest way to do it though is to ask the MTR staff (you can't do it using the machines) to issue you a ticket from Hong Kong station and charge you 100HKD there.