£180 million worth of train carriages built at Derby-based Bombardier will be on show for the Transport Minister, Patrick McLoughlin, today.
The 130 carriages are being tested in London and will be rolled out across the city in December.
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Rain slowly clearing to sunshine and showers on Sunday.
Outbreaks of rain will move southwards turning clearer and colder.
Heavy showers with a chance of thunder but clearing this evening with clear spells overnight.