Cleaners working for facilities firm Interserve on Docklands Light Railway (DLR) began a 48-hour strike on Wednesday of last week over pay and working conditions.
It followed an 80 percent vote for action by the RMT union members.
The union has said that bosses have refused to enter into meaningful negotiations on a series of issues.
One longstanding claim is that workers haven’t received pay rises that maintain the differences between grades.
This is central to the dispute and dates back to the previous firm that ran the contract before Interserve.
The union said the dispute has “ramifications for the entire outsourcing industry”.
Tube workers fight rosters
Tube workers’ unions are balloting for strikes against London Underground (LU) bosses’ pay offer and the implementation of new conditions for the Night Tube.
The Aslef, RMT and TSSA unions are balloting. Results are due by the end of June.
Tory London mayor Boris Johnson wants roster changes that will mean anti-social hours and worse conditions.
LU bosses have also linked negotiations over plans to keep five Tube lines open at night to the current pay deal.
Unions have described it as “derisory”. It is a two-year offer with a “no strike” deal attached.
The best response would be sustained strikes. A strike on 8 July, the day of the Tory budget, would show how workers can resist austerity.
Strike on TransPennine Express
RMT union members at TransPennine Express were set to strike this Sunday to demand the reinstatement of a colleague.
Conductors in Cleethorpes and Sheffield, South Yorkshire, were set to take part in the action.
The union plans to strike every Sunday this month.