20,000 RMT members will strike Saturday across 14 train operating companies in the long-running dispute about wages and conditions.
The latest stoppage in the 18 month long dispute comes as no progress has been made with rail operators, hamstrung by a government who refuses to give them a mandate to make a revised offer.
RMT are also scheduled to take strike action on September 2 if no further progress is made.
RMT general secretary Mick Lynch said: “The government is not serious about settling this dispute which is leading to further disruption for passengers.
“Rail operators are not being given a mandate to make a new offer that we can put to members in a referendum to settle this dispute.
“Meanwhile, our campaign to save ticket offices will reach new levels with a rally outside Parliament on the 31st of August, where we will tell ministers in no uncertain terms that ticket offices must be kept open and our communities preserved.
“Our industrial campaign will continue as long as it takes to get a negotiated settlement, and to save as many ticket offices as possible.
“RMT members remain committed to winning a pay rise, securing their future employment and maintaining good working conditions.
“And they have shown tremendous resolve in the face of a government that is playing politics and refusing to do a deal.”
