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A 48-hour walkout by Tube cleaners will end at 5.30am on January 2nd.
RMT members working for Initial and ISS began their strike on New Year's Eve - in a dispute over pay.
Unions are calling on the Mayor to deliver a "living wage."
Workers who clean London Underground stations are striking over the new year in a dispute over pay.
Rail Maritime and Transport union members working for Initial and ISS began the 48-hour walkout at 5.30am this morning, and will continue until January 2.
General Secretary of the National Union of Rail, Maritime and Transport Workers Union Bob Crow said: "It is these same staff who have played a key role in keeping services clean and safe who are now forced again by their employers to take action for a living wage and recognition of their efforts.
"It is time for London Mayor Boris Johnson to stop talking about a living wage and start acting to make sure that contractors on his services actually deliver it."
Workers who clean London Underground stations are to go on strike over the new year in a dispute over pay. The Rail Maritime and Transport union said its members working for Initial and ISS will walk out for 48 hours from 5.30am on New Year's Eve
General-secretary Bob Crow said: "With the eyes of the world on the London new year celebrations, the many millions watching the countdown must not forget the London transport cleaners on minimum pay rates doing some of the dirtiest jobs with no proper recognition and reward whatsoever.