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16 April 2012, 12:58 | Updated: 16 April 2012, 13:08
Tube Lines workers have voted to walk out in a dispute over pensions and benefits.
The RMT union which represents around 1,000 staff working for Tube Lines said its members backed walkouts by 4 to 1. The staff, who work on the Piccadilly, Northern and Jubilee lines, provide a number of services including emergency repairs to the whole network.