This is the first picture of what the new Crossrail trains set to be manufactured at Bombardier's Derby plant will look like.
The firm was awarded the contract to build 65 trains for the project, beating competition from Japanese company Hitachi and Spain's CAF.
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It will be hot with sunny spells today and feeling humid. Thundery showers are possible later.
Expected to be largely fine and hot but with isolated thunderstorms
Health professionals are advising people to take extra care in hot weather.