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More than 5,000 supporters are expected to make the 400-mile round trip to Stamford Bridge on Wednesday for the fifth-round midweek tie.
Rather than the spearhead of the fight demanded by workers, both rail unions are seeking an exit ramp from the 18-month dispute on sellout terms.
Hundreds of thousands of flights across Europe this summer are in jeopardy after air traffic controllers vowed to take strike action.
The great task that must be resolved is to break through the political disenfranchisement and demobilisation of the working class by the combined forces of the Labour Party and the trade union bureaucracy.
"The train operating companies remain stubborn and are refusing to make any new offer which deals with job security and pay," said RMT boss Mick Lynch