London Midland staff may strike over potential job cuts
London Midland workers could go on strike in a dispute over potential job losses in ticket offices, the RMT union has said.
The union said the plans could turn stations into a "muggers' and vandals' paradise".
It said it would ballot for industrial action unless the firm ruled out compulsory redundancies.
Birmingham-based London Midland said it would avoid making staff compulsorily redundant where possible.
Nine ticket offices are under threat of closure across the West Midlands, Worcestershire and Buckinghamshire.
Another 86 could have their opening hours changed.
RMT general secretary Bob Crow said: "Despite the massive public and political objections, they are bulldozing ahead, totally ignoring the consultation process.
"As a result, 350 staff are left with an axe hanging over their heads.
"Services supported overwhelmingly by the travelling public remain under threat, all in the name of maximising company profits.
"We will not tolerate the company's total disregard for agreed procedures and if we are forced to ballot for action to defend our members we will have no hesitation."
A spokesman for London Midland said consultation with the unions was still at an "early stage".
"We share a common aim, to avoid compulsory redundancies where possible," he said.
London Midland operates services through London, Hertfordshire, Buckinghamshire, Bedfordshire, Northamptonshire, Warwickshire, Staffordshire, Herefordshire, Worcestershire, the West Midlands, Shropshire, Cheshire and Merseyside.