Sydney's public transit card is the Opal card.
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Sydney uses the Opal card. The Opal card covers trains, buses, ferries, and light rail, with fares automatically capped daily and weekly.
You can buy it at convenience stores, newsagents, or online.
Usually yes — it's typically faster than buying paper tickets and often cheaper per ride, even for just a couple of days.
In some cities you can tap a contactless card or phone directly, though it's worth checking current signage or the transit authority's site, since not every system supports it yet.