Rail unions are expected to launch a “summer of disruption” in protest at the introduction of all-night Tube services on September 12

Members of Aslef will walk out from 9.30pm on July 8 and plan further action following an overwhelming vote in favour of industrial action – 97% on a turnout of 81%. The union says drivers would have to work unlimited weekend and night shifts for no extra pay.

Two other unions – the RMT and TSSA – are also balloting their members for strikes, with the results due later in the month. If members vote in favour it is likely to result in a rare, but impactful, co-ordinated action across the Tube network.

But, before then, there will be considerable pressure to avert the costly action which, among other things, will hit the second week of Wimbledon. Talks at Acas have made no progress.

Aslef’s Finn Brennan said: “There is a window of opportunity for London Underground managers to avoid a summer of disruption by engaging with us to find a solution.

“They need to withdraw the threat to impose new rosters and make a realistic offer on pay and conditions.

“Our members are entitled to a family life and to some sort of work/life balance.

“We aren’t opposed to all night services but we want them introduced in a fair and sensible way.”

London Underground’s Steve Griffiths said: “There is simply no reason to threaten Londoners with strike action. We have been in discussions with the unions since February, and are still in the midst of negotiations.

“We recognise the hard and valuable work of our staff and want to give them a pay rise this year and next.

“We also want to minimise the impact of the night Tube on our people, and compensate those it will affect most. But pay levels for our staff are already fair, and any increase must be sustainable.”

Night Tube

Central line : Trains will run between Ealing Broadway and Hainault / Loughton (no service between North Acton and West Ruislip; Loughton and Epping; or Woodford and Hainault)

Jubilee line : Trains will run on the entire line

Northern line : Trains will run on the entire line except on the Mill Hill East and Bank branches

Piccadilly line : There will be a service between Cockfosters and Heathrow Terminal 5 (no service on the Terminal 4 loop, or between Acton Town and Uxbridge via Rayners Lane)

Victoria line : Trains will run on the entire line