tall upright plant - red florets
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its spread in the UK seems linked to the rise of the railways. It's often called "fire-weed" because it readily colonises fire sites (and bomb sites during WW2).
It can be a problem on some nature reserves because it is so vigorous.
It was grown in victorian times as a ornamental plant and it is a import,and your right about the railways as the seeds were carried by the trains passing I think it is an attractive plant but rather invasive.
Lat/Lng: 50.7914, 0.2162
OS grid ref: TQ562014
Typical grassland of the South Downs, Sussex