The National Union of Rail, Maritime and Transport Workers said it will ballot London Underground staff for strike action over proposals to cut station and platform jobs.
London Underground railway workers will go ahead with strikes starting next week, after talks on safety and staffing levels broke down, the RMT union said.
London Underground maintenance workers can go on strike today after a U.K. judge refused to block the walkout.
Unions representing around 10,000 London Underground workers are prepared to resume talks ahead of a 24-hour strike that is due to begin this weekend.
London Underground and BT Group Plc will start a six-month trial next week offering subway passengers Wi-Fi service at Charing Cross station.