Four Tube lines are completely closed during the 24-hour walkout by Transport for London (TfL) staff, while six are operating a “special service”, with trains only operating on less central stretches.
London Overground, DLR, London Tram, London bus and National Rail services are all in operation but are expected to be busier than usual.
Although the Elizabeth line is running, stations that are also served by London Underground may be closed, such as Paddington, Farringdon and Liverpool Street.
TfL is advising people to “avoid travelling where possible on Monday 6 June”. If travellers’ journeys are essential, they are advised to “try to do it after 8.00 and complete your journey by 18.00”.
The RMT Union says the industrial action is in response to proposals that would see 600 jobs axed and current working agreements torn up.
General secretary Mick Lynch said: “We are demanding a direct face-to-face meeting with Mayor Sadiq Khan to sort this mess out.
“There’s no point in our union continuing to sit opposite management representatives who have neither the inclination nor the authority to negotiate a settlement, when the power lies with the Mayor.”