Unions have a "duty to coordinate" strike action in the run up to Christmas as working people are under "generalised attack", the RMT General Secretary has said.
Mick Lynch accepted there would be greater disruption on the railways on Christmas Eve due to walkout by Network Rail staff - who maintain the track - from 6pm until 6am on December 27.
The offer will be put to members but the union has recommended that they reject it.