By Marcus Leach
The Rail, Maritime and Transport (RMT) Union are considering taking legal action over the decision not to award Bombardier the Thameslink contract.
The Derby-based firm lost out on the contract to German-based Siemens, a decision that has seen Bombardier announce the cutting of more than 1,400 jobs.
The contract, worth £1.4 billion, was offered to Siemens as the government claimed it offered better value for money.
But the Rail, Maritime and Transport (RMT) Union said it may challenge the decision on the grounds that the local economy was not properly "factored in".
The decision to award the contract, to build 1,200 carriages for the new Thameslink, to Siemens was followed by news that Bombardier would cut 446 permanent positions, and a further 983 temporary staff positions.
There have been numerous calls for the government to review their decision, although such a move has been ruled out.
"The failure to factor in the wider economic impact in East Midlands makes a total mockery of the government's core claim that Siemens represented best value for the British taxpayer," RMT leader Bob Crow said.
"If that was the grounds for killing off Bombardier then clearly it was based on a total lie and that may be grounds for a challenge."
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