Railway workers are due to stage another 24-hour strike next month amid an escalating national dispute over pay, job security and conditions.
Members of the Transport Salaried Staffs Association (TSSA) from nine rail operating companies plus Network Rail (NR) will depart from midday on Monday 26 September.
The union remains in talks with NR over the possibility of a settlement, but is urging Transport Secretary Grant Shapps to step in to try to break the impasse.
The strike will coincide with the Labor Party conference in Liverpool.
As a labor affiliate union, the TSSA said it would seek the support of stewards and MPs to join them on the picket lines.
TSSA union leader Manuel Cortes said: ‘Grant Shapps’ dead hand unfortunately prevents the rail operating companies from making a revised and meaningful offer.
“Frankly, he either sits down at the negotiating table with our union or he steps aside to allow the bosses of the railways to negotiate freely with us, as they have done in the past.
“The reason for the current standoff lies squarely at Shapps’ doorstep and passengers are paying a heavy price for his incompetence and intransigence.
“I welcome the fact that negotiations are ongoing with Network Rail and that the gap towards a resolution is narrowing. Time will tell if a deal can be reached to avert our next strike.
“I will stand on our picket line in Liverpool and encourage other Labor delegates and MPs to do the same, so they can rightly show that they stand side by side with those fighting the crisis. the Conservatives’ cost of living.