Opal travel card readers will be installed at Chatswood by the end of the week. They will also be switched on at railway stations between Milsons Point and Chatswood by Friday. The Opal readers will be operational at 17 train stations across Sydney CBD and the lower north shore.

More than 15,000 people have an Opal card. They have made 330,000 trips since the new technology was rolled out late last year.

The new Opal card will be progressively rolled out across the network over the next 15 months.

Read an earlier story about the Opal card.