An overground line has said the impact on train services will be "extremely severe" if planned strike action goes ahead on Bank Holiday Monday. 

Members of the RMT and Transport Salaried Staffs' Association (TSSA) have voted to walkout for 24 hours over pay and jobs from 5pm on Bank Holiday Monday (May 25). 

Signallers, maintenance staff and station workers will walkout in what will be the first UK-wide rail strike in 20 years. 

Abellio Greater Anglia, which currently runs the Chingford to Liverpool St line until the TfL takeover on May 31, has said there will be no services at all after midday on Monday until Wednesday morning. 

A statement issued by the company said: "If the strike goes ahead the impact on train services will be extremely severe.

"Our advice to customers is do not travel by train on Monday and Tuesday.

"We advise you to make other travel arrangements. Please also note that the action will affect the entire national rail network and therefore affect plans for journeys on other routes. 

"We apologise for the major inconvenience caused to your travel plans."

There will be an extremely limited, skeleton service operating on Greater Anglia routes between London and Norwich, London and Colchester, London and Shenfield and London and Stanstead Airport on Tuesday. 

Services will start operating as normal from 6am on Wednesday, although Greater Anglia is warning there will be disruptions and alterations as they work to restore the full normal service. 

TfL has said the vast majority of tube lines and London Overground services will operate normally but some routes on the Bakerloo, District Line, Waterloo and City and London Overground will be affected. 

National Rail is expected to list full details of timetables for May 25 and 26 on its website this afternoon. 

The dispute is in relation to a pay offer by Network Rail to around 25,000 staff for the years 2015 to 2018. 

Both union have rejected the offer which includes a £500 lump sum per worker this year, followed by three years of increases matching inflation, as a well as a commitment to no compulsory redundancies until December 2016.

Network Rail has issued a legal challenge to the TSSA union and will go to court today in an attempt to block strike action as they claim there is "numerous defects" in the union's ballot.