This is how it works on the Gautrain in Pretoria/Johannesburg in South Africa. You scan when you enter the system, and you scan when you exit. Your fare is cal

This is how it works on the Gautrain in Pretoria/Johannesburg in South Africa. You scan when you enter the system, and you scan when you exit. Your fare is calculated based on where you enter and exit. If you stay in the system longer than some define period of time, you are automatically charged the maximum fare, regardless of where you got on and off. You can either scan with a dedicated train fare card, your debit/credit card and also NFC mobile payment. The buses linked to the train service and the parking uses the same payment system, so you get automatic discounted bus fares and parking fees if you actually use the train as well, but you can park and use the bus without taking the train. It works quite well.