The Duke of Gloucester was a prototype for a class never built. It took 17 years for volunteers to restore her from a scrapyard condition. The 1954 locomotive will star at Swanage Railway's Autumn Grand Steam Gala and Vintage Transport Rally next month.
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Trains between Oxford and Didcot will be replaced by bus services for more than two weeks while engineers raise the track.
Tuesday night's forecast for the west of the region
Tuesday night's weather for the east of the region