The RMT has suspended strikes due to be held on March 30 and April 1, the union has announced.
The move follows further discussions between the union and the Rail Delivery Group in the long-running dispute over pay, jobs and conditions.
We are now jointly focused on working constructively towards a settlement to this dispute— Rail Delivery Group spokesperson
The union has already resolved its row with Network Rail in a similar dispute.
A Rail Delivery Group spokesperson said: “We welcome this positive step by the leadership of the RMT to call off their planned action on March 30 and April 1. This is great news for our customers and for our staff.
“We are now jointly focused on working constructively towards a settlement to this dispute, which will mean we can do what we have always wanted to do – give our people a pay rise and help secure the long-term future of the railway with rewarding careers for all those who work on it.”