You can ask Siri to check your opal card balance now. : r/sydney
Employee and Former Employee Opal Cards are changing | transportnsw.info
Manage your Opal card | transportnsw.info
Negative balances on Opal cards amount to $2.9 million loss - Trainsfare
Choose a card type | NSW Government | Opal
The Opal Card User on Twitter: "@oliverzip log in; if you've “lost” your card, it'll run you through transferring the balance onto another card http://t.co/AEMw6MZu8D" / Twitter