As members of the Rail Maritime and Transport Union voted to strike, the union warned further action would be taken if the row is now resolved. Workers on the Piccadilly Line will walk out for 24 hours on 4 December, but didn't rule out a 48 hour strike at a later date.
RMT general secretary Bob Crow said:
"The overwhelming 88% vote in favour of strike action can leave management in no doubt that the union is not prepared to accept the continuing abuse of individual drivers and negotiated agreements on the Piccadilly Line."
Workers on a busy London Underground line are to strike in a row over agreements being "ripped up". Members of the Rail Maritime and Transport union on the Piccadilly Line will walk out for 24 hours from noon on December 4.
"The outcome of these separate ballots will now be considered by RMT's executive but the message could not be clearer - we are stepping up the fight to protect agreements, jobs and working conditions across the whole of London and to eliminate the scourge of poverty pay on cleaning contracts."
The RMT union said that it was holding a strike ballot "in response to London Underground riding roughshod over agreements and abusing a range of agreed policies and procedures".
They are unhappy with plans to split a depot in Acton Town into two - claiming that that tube bosses are "ripping up rosters and booking times" and "refusing perfectly reasonable requests for decent staff facilities".
RMT General Secretary Bob Crow said:
"Driver and instructor members on the Piccadilly Line are furious at this unilateral attack by the company on working conditions, agreements and procedures and we are moving forwards with plans for a ballot for strike action.
"We will of course be in talks with our sister drivers union ASLEF and London Underground should be in no doubt about the unions determination to protect working conditions and to stop the abuse of procedures."
RMT General secretary Bob Crow said: "One of the first things fascist dictators like Hitler, Mussolini and Pinochet did when they seized power was to ban transport workers from taking strike action so the Tory group on the London Assembly find themselves in some high profile company on this one.
"This crowd have obviously over-dosed on their post-Thatcher adulation and are looking to ramp up the anti-union rhetoric in advance of the publicly financed funeral on Wednesday.
"Of course, banning the fundamental human right to withdraw your labour, a right that distinguishes a free workforce from forced labour, is all the rage on the far right and anyone stupid enough to try and embark on such a policy is doomed to failure."