Last-ditch talks are being held in a bid to avert a strike on London Underground which threatens travel misery for Christmas shoppers this weekend.
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Members of the Rail, Maritime and Transport (RMT) union on the Central Line are due to walk out for six hours on Friday evening and most of Saturday.
The strike will cripple services on the line, one of the busiest in the capital, and halt its Night Tube on Friday.
The union has described industrial relations as at "breaking point" following the dismissal of a worker for failing a random drugs test.
The two sides will meet on Wednesday at the conciliation service Acas.
Meanwhile, strikes by RMT members on South Western Railway and Arriva Rail North are set to go ahead on Saturday in the long-running dispute over guards.
Hundreds of trains will be cancelled.
Australian Associated Press