Tube strikes: Full list of lines affected in latest walkout on London Underground

London Underground drivers are on strike again today.

Members of the Rail, Maritime and Transport union (RMT) have already walked out once this week, on Tuesday, after failed negotiations with Transport for London (TfL).

Here's everything you need to know.

What's happening?

There will be a limited service before 6.30am, and customers have been urged to complete their journeys by 9pm.

A normal service is expected on Friday, though some lingering delays are possible.

Which lines are affected?

TfL said no service is expected on the Circle line, Piccadilly line, and Metropolitan line between Baker Street and Aldgate and the Central line between White City and Liverpool Street.

Services are expected across all other Tube lines on both days, but disruption to journeys is expected, with service levels varying across the network.

Heathrow Airport said on X that rail replacement buses will replace the Piccadilly line at affected times, with all other services, including the Heathrow Express and bus services, running as normal.

How do you avoid them?

TfL advises travellers to plan ahead and check before they travel by using its TfL Go app, which helps people to find how to get from one point in London to another by public transport, Journey Planner (a web-based service), or by using the latest status updates on the TfL website.

What's the impact been?

TfL said Oyster and contactless card taps were only down by around 10% on Tuesday, "showing that Londoners and visitors were still able to travel despite the strike action".

It said services ran on most lines, with more than 60% of drivers working.

Why are drivers striking?

The RMT union is opposed to a new, four-day week because of the impact on length of shifts and other "critical" issues.

But TfL stressed the proposals are voluntary and branded the decision "bitterly disappointing".

ACAS, a conciliation service, was involved in the talks.

An RMT spokesperson said: "Despite our best efforts in ACAS talks, TfL have failed to provide assurances on our members' deeply held concerns around fatigue, reduced flexibility, shift lengths and the impact these proposals could have in a safety-critical role like Tube driving.

"We remain available for meaningful talks, but strike action tomorrow will now go ahead."

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A TfL spokesperson said: "It is bitterly disappointing that despite five hours of meetings with the RMT at Acas and repeated assurances that the four-day working week proposals will remain voluntary, RMT has chosen to continue with its disruptive strike action.

"We will do all we can to provide as much service as possible during this action."

(c) Sky News 2026: Tube strikes: Full list of lines affected in latest walkout on London Underground