Members from the Rail, Maritime and Transport (RMT) union are in the process of a mass walkout due to a pay and pension dispute this week, causing major disruptions to rail networks.
Amid what is described as the biggest rail strike action since 1989, around 50,000 Network Rail workers are walking out.
RMT general secretary Mick Lynch said before the action: "Railway workers have been treated appallingly and despite our best efforts in negotiations, the rail industry with the support of the government has failed to take their concerns seriously."
