Next week's two day strike by guards at South Western Railway will go ahead after peace talks failed to resolve the dispute.
The RMT union is taking action because the company will not guarantee the future safety role of guards on trains.
The action will mean 700 trains will be cancelled on the busiest commuter network in Europe next Wednesday and Thursday. Buses will replace trains on some routes. All stations will see fewer trains.
The company hope to run around sixty per cent of services using managers working as guards. 650,000 passengers face disruption.
The RMT say SWR is refusing to guarantee safety critical guards will be kept on every train and will be safety trained.