Transport for London (TfL) has warned of disruption to thousands of people, after the Rail, Maritime and Transport (RMT) union confirmed strike action coinciding with the London marathon will go ahead next week.
A four-day batch of strike action is set to hit the DLR, after talks failed to resolve a row between the union and the firm operating the service.
A walkout has been called by the RMT for KeolisAmey Docklands members from 4am on Friday 20 April to 4am on Tuesday 24 April.
The strike is due to a row over a number of workplace issues between the RMT and KeolisAmey Docklands - which operates the DLR on behalf of TfL.
Mark Davis, TfL’s interim general manager of the DLR, said:
Millions of pounds are raised for charity at the London Marathon and we don’t want to see the thousands of people who have signed up to run, or their supporters, disrupted.
We urge RMT and KeolisAmey Docklands to continue with discussions to settle their dispute. If the strike goes ahead, we will work with the operator to provide as much of a service as possible. We will ensure customers have all the information they need to re-plan their journeys during this unnecessary strike.
Talks had been underway at conciliation service Acas again this week, but the union said there had been no significant progress on key issues and so the next round of action - including the Sunday of the London Marathon - will go ahead.
For the 48-hour strike, TfL had warned there was unlikely to be any DLR service at all, though it did manage to run a special service for part of both days.
The union's general secretary Mick Cash said:
RMT continues to push for a negotiated settlement in a dispute that is about turning the tide on outsourcing and ensuring workplace justice for this key group of London transport workers.
Our negotiating team is frustrated that the talks that wound up yesterday have failed to make any significant progress on the key issues.
Abdellah Chajai, managing director of KeolisAmey Docklands, said: “Again, we are faced with RMT refusing to genuinely negotiate and avert unnecessary disruption to our passengers, not least the London Marathon runners and their supporters who are raising millions of pounds for charities.
Despite this frustrating move, we remain committed to meaningful and reasonable discussion with the union to resolve the issues and we have agreed to meet with the RMT again at the earliest opportunity. The announcement of strike action is totally unnecessary and unlike the union, our focus continues to be on doing all we can to avoid disruption for our passengers.