The RMT rail union is to stage a demo outside Parliament to mark the anniversary of its dispute with Southern.
Southern train guards – or conductors – have become on-board supervisors, with Southern imposing new contracts during the long-running dispute.
The move came as part of the switch to driver-only operation (DOO) of a new fleet of trains serving the line from Brighton to London.
The protest is due to take place next Wednesday (26 April) when talks are scheduled between the union and bosses at Southern which is part of Govia Thameslink Railway (GTR).
RMT general secretary Mick Cash said: “Heroic RMT members working for Southern Rail have taken 31 days of industrial action against the threat to rail safety from driver-only operation.
“Those RMT members have put their passengers and their local communities first and they are a credit to the entire trade union movement.
“It is right that rail workers from across the UK should have a chance to come together with our Southern members to mark the first anniversary of the dispute.
“DOO is a national threat and this protest provides the opportunity for members from across Britain to make their voices heard and for us to show the politicians and media that our fight for passenger safety will continue.”