Workers on London's Docklands Light Railway are set to stage a fresh 48-hour strike as part of an ongoing row over pay.
Members of the Rail, Maritime and Transport (RMT) union working as cleaners, security staff and travel safe officers on the DLR will walk out from 5.30am on Thursday February 1.
The workers, employed by contractor ISS, took strike action on New Year's Eve, but the union said no progress had been made over pay and other issues.
RMT general secretary Mick Cash said: "We are supporting our members' further strike action in a bid to force management to properly adhere to the agreed negotiating machineries and stop trying to impose fundamental changes to working conditions.
"RMT reps have continually chased management to resolve the dispute but the company are blatantly ignoring the union's concerns.
"We are expecting further solid support in this dispute."
Mark Davis, Interim General Manager of DLR, said: "This issue is between the RMT Union and ISS, the KeolisAmey Docklands contractor which provides cleaning and security staff on the DLR. We have been assured this will not have an impact on our customers or the DLR service. We urge all parties to sit down and talk through the issues to try and resolve them as soon as possible.”