London Underground workers began a 24-hour strike Tuesday as members of the Rail, Maritime and Transport union (RMT) walked out in a dispute over working hours.

The union plans a second 24-hour strike on Thursday after last-minute negotiations failed to resolve the disagreement over proposed changes to the working week.

The strikes are expected to cause significant disruption to London's transport network, affecting millions of commuters and travelers who rely on the Underground system for daily transportation.

The RMT union and Transport for London have been in ongoing discussions about working time arrangements, but the parties were unable to reach an agreement before the strike deadline.

Further talks between union representatives and management may continue as both sides seek to resolve the dispute and prevent additional industrial action beyond the two planned strike days this week.