Bombardier will not be confirmed as losing the Thameslink contract for another ten days according to reports.
German firm Siemens will only then be confirmed as the winners of the contract due to a legal requirement known as the Alcatel standstill period.
This allows time for unsuccessful bidders to challenge the decision.
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They were taken as a precaution, and residents are being advised to keep windows and doors closed as teams continue to clear the spill.