Around 2,500 staff working for failed London Tube consortium Metronet will strike for 48-hours following a row over outsourcing, pensions and travel facilities.
Britain's National Union of Rail, Maritime and Transport Workers (RMT) says it wants guarantees that Metronet contracts - currently being transferred to Transport for London (TfL) – will allow employees access to the TfL pension scheme and travel facilities.
"Despite weeks of detailed talks and positive discussions with the mayor we have still not won the unequivocal written guarantees we are seeking to protect our members' interests," says RMT General Secretary Bob Crow.
The strike is scheduled to run for 48-hours from 10.30am on Monday 28 April, but details of affected services have not been outlined.
TfL lodged a formal bid to take control of Metronet following the collapse of the consortium last October.
By Ozge Ibrahim