RMT union chief Mick Lynch says strike action – taking place on Thursday and Saturday – will continue "until we reach a settlement".
Speaking to Sky News he said his members were "completely committed to the cause" and would "keep going" in their long-running dispute over pay, jobs and conditions.
It came as fresh strike action by a number of unions hit the rail network, with only around a fifth of services running, and half of lines closed, with a further walkout planned for Saturday.
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