London General Bus drivers based at Putney bus garage voted against an offer from senior management at a consultative ballot on Friday of last week.
About 620 members of the T&G union voted for industrial action up to and including a strike, with 270 voting against any action.
Barry King, regional industrial organiser for T&G, said, “There was a straw poll on Friday about whether drivers would be prepared to take industrial action.
“This was to assess their strength of feeling in preparation for a postal ballot. Industrial action is one of the possibilities. At this stage I am writing to the company and inviting them to resume negotiations.”
Under London Transport’s privatisation in 1993, wages were reduced, hours increased and the final salary pension scheme for workers abolished.