Network Rail has told ITV News Central that trains through Birmingham International were stopped at 8:20pm this evening, following communication with Air traffic Control at Birmingham Airport.
Lines were operational again at 8:32pm, but the stoppage is still causing delays on some rail services.
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Thousands from around the country went to the Black Country to take part in Tough Guy - a challenge with more than 250 obstacles.
Mainly dry overnight but very cold with temperatures dropping sharply as winds ease down giving a widespread frost.
It will be dry with clear spells across the region overnight.