The staff, employed by DLR contractor Serco Docklands, voted in favour on both strike action and “action short of a strike”. 162 union members voted for strike action with 36 voting against while 175 voted for action short of a strike with 21 against.
The union says the company has also failed to to consult over redundancies and accused it of “victimisation” against two union members.
RMT General Secretary Bob Crow said: “The industrial relations situation at Serco Docklands cannot be tolerated any longer and our members have now voted overwhelmingly in favour of strike action and industrial action short of a strike.
“This ballot shows management we mean business and that we will not accept their disgraceful attitude towards their staff and it is now up to the company to respond positively to our demands for a solution that addresses all of the issues at the heart of this dispute.”
Serco has previously said it was making a “genuine attempt to resolve the issues”.
