Eurostar train managers today called off a planned 48-hour strike after accepting a new offer in a row over expenses.
The managers, members of the Transport Salaried Staffs Association, were due to walk out from midnight, joining drivers belonging to Aslef.
The TSSA said its 20 train managers would be now be working normally over the next two days and further strikes on December 26 and 27 were now cancelled.
General secretary Gerry Doherty said: "This is obviously good news for the travelling public and our Eurostar members.
"We always wanted a negotiated settlement rather than disrupting the cross channel travel plans of thousands of passengers over the Christmas period."
The row centred on a claim by union members that the falling pound meant their expenses were lower than their French counterparts who are paid in higher value euros.
As part of the settlement it is understood they have accepted a one off payment of more than £600 to compensate for lost earnings caused by the weak pound.
It is believed further talks are to be held between Eurostar and Aslef in a bid to avert the drivers' strike.