Rail workers astatine 14 bid operators volition onslaught connected 13 May, connected the time of the Eurovision Song Contest final, aft the RMT national rejected the latest wage deal.
The connection was aimed astatine ending a long-running wage dispute.
But the national said accepting the connection would person meant nary further onslaught enactment could instrumentality place.
It follows bid drivers national Aslef calling strikes connected 12 and 31 May, and connected June 3, the time of the FA Cup Final.