WORKERS on three rail networks will walk out next month as their union turns up the heat in a long-running row over driver-only trains.
Rail union RMT members on Southern, Merseyrail and Northern will walk out for between one and three days in coming weeks.
RMT leader Mick Cash said guards were "angry and frustrated" at a lack of progress in disputes.
Southern has already replaced guards with "on-board supervisors" who are not required to be present for trains to operate.
Northern and Merseyrail are planning to follow the beleaguered operator’s lead in introducing new trains where doors are opened and closed by drivers rather than guards.
Northern deputy managing director Richard Allan said he was "deeply disappointed and hugely frustrated" by the upcoming strikes.