I’m really interested about how you did that RFID thing, because while Helsinki has had a RFID card for its public transportation for many years they totally forgot about the user and user interface/experience.

For example, you need both hands two use the system and the tiny low-contrast two-line screen is usually at about waist height (see: http://www.ytv.fi/ENG/transport/guide/travel_card/travel_card/buttons.htm ). In my opinion, it only works if you have a subscription, otherwise it will drive you insane. They also bought the system from a Finnish company who then decided that selling that system wasn’t their business and stopped developing it, causing maintaineance and other costs to skyrocket.

We’ll be moving into a new system in couple of years. Hope they get it right then.