About 20,000 members will take strike action on 26 August and 2 September over pay and conditions.
Progress in the RMT's dispute with the 14 train operating companies has effectively been at a standstill since April, after it rejected the latest proposals from the RDG.
The union said it had been left with "little choice but to take further action", insisting it had seen no improved offer from the RDG, which represents train operating companies.
Danmark Seneste Nyt, Danmark Overskrifter
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