Train drivers are to resume their strikes next month in the long-running dispute over pay.
Drivers at 12 train operators will walk out on October 1 and 5, affecting travel to and from the Conservative party conference in Birmingham - and the London Marathon, sources told the PA news agency.
A planned strike by drivers on September 15 was called off as a mark of respect following the Queen's death.
The drivers' union Aslef will not be making any comment or public comment until after the Queen's funeral next week.
Industrial disputes in the rail industry and other sectors including post and telecoms have led to a summer of strikes, which are set to resume in the coming weeks.
A string of major rail strikes were suspended following the death of the Queen.
The RMT union also said it was calling off planned walkouts on September 15 and 17 as the nation pays its respect to its longest reigning monarch. The RMT has not yet rescheduled strike action.
And the Transport Salaried Staffs Association (TSSA) has also not rescheduled planned strikes that it called off in the wake of the Queen's death.
TSSA members on Avanti West Coast had been due to strike for three days in a row from September 15-17. TSSA members at nine train operating companies and Network Rail were also due to walk out from midday on Monday 26 until midday Tuesday 27 September.
Aslef's rescheduled action will cause major disruption to delegates arriving for the Tory conference in Birmingham.
Many will have been due to arrive on Saturday 1 October, the first day of strike action, ahead of the conference kicking off on the Sunday.
Delegates then leave on the afternoon of Wednesday 5 October, due to be the date of Liz Truss's first speech to the party faithful since she became PM.
It will also affect people trying to get to London the day before the London Marathon on October 2.
