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According to the articles how does the cost of rail travel in the UK compare with other European countries?

Why do you think there is such a difference in the percentage of monthly income spent on rail travel in the UK compared with other European countries mentioned in the article?

https://www.theguardian.com/business/2017/aug/15/uk-commuters-brace-rail-fares-hike-uk-inflation

https://www.theguardian.com/money/datablog/2017/jan/06/tracking-the-cost-uk-and-european-commuter-rail-fares-compared-in-data