The strike is separate to the national pay dispute, which looks to have been ended following talks this week.
Train drivers at London North Eastern Railway (LNER) are to stage a fresh round of weekend strikes for almost three months.
Members will walk out every Saturday between 31 August and 9 November and on every Sunday from 1 September to 10 November.
Aslef, the train driver’s union, said the strike followed “a breakdown in industrial relations, bullying by management” and other disagreements with LNER.
It is separate from the long-running national pay dispute with 16 train companies, which looked to be resolved on Wednesday when a pay offer was made by the Department for Transport.
Aslef said it had recommended its 13,000 members accept the terms.
LNER trains operate from London King’s Cross station and pass through major cities including Newcastle, York and Durham.
Mick Whelan, general secretary of Aslef, said the union had been “forced into this position”.
He said: “We would much rather not be here. But the company has brutally, and repeatedly, broken diagramming and roster agreements, failed to adhere to the agreed bargaining machinery, and totally acted in bad faith.
“When we make an agreement, we stick to it. This company doesn’t. And we are not prepared to put up with their boorish behaviour and bullying tactics.”
LNER said it was “surprised and disappointed” by the strike following “constructive conversations”.
“We will continue to work with Aslef to find a way to end this long running dispute which only damages the rail industry,” LNER said.
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