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Travel helper: why does a train journey come out 4X worse than flight?

Using forrect factors for the travel tool (Travel Helper)?? I tried comparing a journey from King's Cross to Edinburgh, and it was telling me the flight would be 100kg of CO2 and the train would be 400kg!!
Defra's greenhouse gas emission factors for company reporting say the average for a domestic flight is 175.3gCO2/km, and national rail only 60gCO2/km. So why does train travel come out four times worse overall?
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