The RMT union is balloting drivers and guards who work for Greater Anglia as part of an escalating row over the operation of doors on trains by guards.
Strikes would mean chaos for hundreds of thousands of commuters. But Greater Anglia said tonight they have no plans to remove guards from trains and instead are recruiting more. Natalie Gray has the story:
Rolling strikes have brought the south-east of England to its knees over Southern Rail's plans to remove guards from services and extend driver-only operated trains. And now Greater Anglia staff are to be balloted on the same issue.
200,000 people use Greater Anglia trains every day - many commuting to the capital.
Any strike would mean misery.
But the rail company insists guards will stay.