Green Travel Pledge

Rail emission calculations: These values are based on the average emissions of the models of train travelling between the specific origin and destination over a typical week.

The train occupancy is based on the average number of passengers on trains travelling between the specific origin and destination over a typical week using modelled rail = data (MOIRA). Where first class travel is an option, the emissions are weighted based on the increased footprint of a first-class seat.

Distances are based on the actual rail distance between the two stations from Network Rail data. Where more than one route exists, an average is calculated based on the proportion of trains running on each route.

Car emission calculations: These values are based on the emission conversion factors of an average sized (petrol/diesel, plug-in hybrid or battery electric) car published in the UK Government Department for Energy Security and Net Zero (DESNZ) Greenhouse gas reporting, using the latest "Business Travel - land" data set. The occupancy of a car is assumed to be the DESNZ average.

Distances are calculated using the OSRM (Open Source Routing Machine) project. Coordinates for each station pair were processed to determine the shortest road route.

Air emissions: These values are based on the emission conversion factors for domestic flights published in the UK Government Department for Energy Security and Net Zero (DESNZ) Greenhouse gas reporting, using the latest "Business Travel - air" data set.

More information on the methodology is available on the Green Travel Pledge page.