The strikes provided by train managers from the west coast of Avanti have been suspended to allow negotiations in a long -standing dispute on the work of the rest day.
Members of the Rail, the Maritime and Transport Union (RMT) planned to release the following three Sundays.
Before Christmas, the union said that a revised proposal had been rejected by 83% of the 400 members involved in the dispute, before announcing new strike dates.
The RMT described the last postponement as a “breakthrough”, while Avanti said that it had remained open to work with the union to resolve the dispute.
The secretary general of the RMT, Mick Lynch, said: “This breakthrough was carried out thanks to the strength and determination of our members, whose industrial action forced Avanti to seriously engage in this dispute.
“Consequently, a strike action has been suspended to allow space for constructive talks.
“We are fully determined to use the next three weeks in a productive way to secure a negotiated regulation in good faith.”
But Mr. Lynch warned that Avanti had to “demonstrate a real desire to compromise” if he wanted to avoid an escalation of this dispute.
The west coast of Avanti said it was happy that strikes were suspended.
“We are open to working with the RMT to resolve this dispute and will continue to work together to find a resolution,” said a spokesperson.
“This means that the tickets will be back on sale for the dates concerned and we can use our normal Sunday schedule.”