Planned strikes by drivers on London's Night Tube this Saturday and three weeks later have been called off, ASLEF has said.
Union members were set to walk out on the nights of 8 and 29 April over concerns they were going to be "blocked" from applying for full-time roles on the Tube in favour of new recruits.
They were also angry that their overnight work schedule did not qualify for overtime pay.
Explaining the decision ASLEF official Finn Brennan said London Underground had clarified its position.
"Our aim has always been to make sure that Night Tube drivers were not forced to remain in the role indefinitely, while new recruits took up full-time positions," he said.
"The new proposal means that London Underground will fill full-time vacancies from waiting lists in line with agreements and Night Tube drivers will not be 'jumped' by new recruits," he said.
Mr Brennan said the 100% vote in favour of industrial action by ASLEF members meant the union had achieved a fair settlement that ensures Night Tube drivers will move to full-time roles much sooner than London Underground had planned.
Proposals will be put to a ballot of ASLEF members with a recommendation to accept.
London Mayor Sadiq Khan said it showed engaging with unions was the best way to avoid industrial action.
He said: "While my predecessor refused to engage with the unions, we've now seen a number of strikes averted because we're prepared to talk constructively to the people who work for TfL."
London Underground operations director Peter McNaught said: "When we introduced the service we promised to provide career progression for Night Tube train drivers and we remain committed to doing so."