Southern staff have voted to strike over plans to remove guards from trains.

The Rail, Maritime and Transport (RMT) union, which represents staff who work at the under-fire franchise, confirmed they will strike for 24 hours on Monday, March 13.

The walkout will be the 30th day the transport union will have taken industrial action. Southern staff will be joined by Merseyrail and Northern Rail members who also voted to strike on the same day.

It follows a bitter dispute with the company over claims that driver-only-operated trains would not be safe as only one person would oversee all operations.

The Office of Rail and Road (ORR) has previously said trains operated by only by the driver were safe. An ORR spokesman said: “Trains with doors operated by drivers have been in operation in Great Britain for more than 30 years.

“ORR has scrutinised this approach, and our inspectors are satisfied that with suitable equipment, proper procedures and competent staff in place, it is a safe method of working."

Mick Cash, RMT general secretary, said: “The abject failure by Southern Rail to meet with us, to clarify their exact position on the second safety-critical member of staff and to take the safety issues seriously has left us with no option but to confirm further action.

“These disputes could have been settled if Southern/ Govia Thameslink Rail (GTR) had sat down and listened to our case and given the guarantee of a second-safety critical member of staff on their trains.

“We now have the best part of two weeks before the next phase of action for the company to take the issues at the core of this dispute seriously, get round the table with the union and negotiate a settlement.

“It is now down to Southern/GTR to face up to their responsibilities and engage in genuine and serious talks that address the fundamental issue of rail safety on their services. RMT expects the company to take up that offer from the union as a matter of urgency.”

A Southern spokesman said: “This will be the 30th day of RMT strike action for Southern passengers and today’s news is clearly disappointing. We asked the RMT executive to suspend any further action when they met today so that talks could take place, instead they have chosen to put their members through even more pointless industrial action.

“They say they want to talk, but they are hell-bent on further strike misery and causing disruption and hardship to people’s everyday work and family lives.

“We were able to run almost 90 per cent (87 per cent) of services on the last RMT strike day and we will again have contingency plans in place to be able to run as full a service for the travelling public on the day.”