At a virtual meeting on 4 August, the general secretaries of Aslef, RMT and TSSA each reaffirmed their commitment to preserving Britain’s link to continental Europe.
In May, Eurostar reached a deal with its backers having come under financial pressure due to the pandemic. The cross-channel rail operator has been running "a handful of services" a day since the initial lockdown.
Mick Whelan, general secretary of Aslef said the first "battle" is to protect jobs and the future of Eurostar.