London, June 14 (Reuters).– A British union warned on Tuesday the country could face a "summer of 
discontent" across its railways as thousands more workers are balloted for strike action in an escalating dispute over pay and conditions.
The Transport Salaried Staffs' Association (TSSA) said on Tuesday it had issued a notice of a ballot to more than 6,000 staff at Network Rail, the owner and infrastructure manager of most of the rail network in Britain.
More than 50,000 workers belonging to the Rail, Maritime and Transport Workers (RMT) union are already due to walk out on June 21, 23, and 25, threatening a complete shut-down of Britain's train network.
The TSSA said the ballot was part of a dispute over working conditions ...
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