Train drivers have backed away from planned industrial action this week following "constructive conversations" with Metro.

Rail Tram and Bus Union state secretary Luba Grigorovitch said the move to call off industrial action for the weeks of August 12 and 19 was a show of good faith.

Staff had threatened to refuse to check tickets, and ban overtime as well as last-minute scheduling changes such as station skipping over the next two Mondays.

A four-hour stoppage planned for August 27 remains on the table, she said.

"Our members are committed to supporting the travelling public while in pursuit of a fair enterprise agreement," Ms Grigorovitch said.