The Secretary of State for Transport, Patrick McLoughlin will open First Great Western's new train care depot later.
The £150 million pound facility will maintain all the company's trains across the Thames Valley.
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Nearly 1,500 people were evacuated from a central London nightclub, hotel and Charing Cross railway station after a major gas leak.
Holly has Tuesday's forecast for the east of the region.
Holly has today's forecast for the west of the region.