RAIL union TSSA is to ballot customer service managers at London Underground on strike action in a dispute over changes to working practices.

The union says bosses plan to “dramatically reduce” the numbers of customer service managers and change their terms and conditions and, potentially, their work locations.

Talks with the conciliation service Acas have failed to resolve the dispute.

TSSA general secretary Maryam Eslamdoust said: “We will not tolerate any worsening of our members’ pay, terms and conditions.

“We have tried to resolve this issue amicably with London Underground but its unwillingness to give our members clear reassurances about their terms and conditions has left us with no choice but to ballot for industrial action.

“I urge our members to vote yes for both strike action and action short of strike action.

“In this way, we can send London Underground a clear message that it cannot attack our members’ jobs without consequences.”

Voting begins on Thursday.