Eco Methodology
Understand the footprint beside your train: what it counts, how it’s estimated, and where the gaps are.
One journey, one person
CO₂e expresses greenhouse gases as a carbon-dioxide equivalent. The estimate is per passenger at average occupancy, not a measurement of your particular train.
We add the figures for each travel segment and round the display. The detail beside your train shows the journey distance too. If any segment’s emissions are missing, we leave the total unavailable.
From distance to emissions
Distance comes from timetable or operator data. Where it’s missing, a route estimate adds an allowance for track curves and detours.
Distance is multiplied by an emissions factor. Rail factors reflect each country’s electricity mix and diesel use; international trains are weighted by distance in each country. Buses and ferries use their own factors.
Why another figure might differ
Electricity uses the local grid mix, rather than an operator’s renewable-energy contracts. Different assumptions about energy, occupancy and construction can produce different estimates.
When a figure isn’t available
Older saved journeys may predate emissions data. A fresh search can bring updated figures where available. Missing data is never treated as zero emissions.