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10 June 2010, 14:55
The RMT union is warning commuters face an increased threat of travel problems due to strikes by rail workers later this month.
Members on Docklands Light Railway will walk out for three days from June 23rd in a row over pay.
The strike by staff employed by Serco coincide's with the first of two 48-hour stoppages by tube maintenance workers employed by contractor Tube Lines.