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You can check the balance on your metrocard:
The validator will also display the fare deducted and the balance on your card as you board your bus, train or tram and as you enter or exit Adelaide Railway Station.
If you have registered your card, you can view your transaction history online.
For help understanding your metrocard website account balance and transaction history view the guide to metrocard (PDF 702 KB)
Why not travel with stately style?
Celebrate this state with six new metroCARDs, showing iconic South Australian destination.