@BenjaminEHowe@TLRailUK My guess would be that it’s a completely isolated private network (only within the train) so they just used that public block, so that internal routing to 10.x etc. still works.
@dhruv_rathee While I agree that there is some fudging of numbers going on, you cannot objectively use readings from home AQI monitors. For one AQI is a formula composed of multiple sensor inputs. Different monitors might use different formulae. Most monitors will not even have all sensors.
So @SouthernRailUK has the funniest OBSs. “Hello this is your guardian angel, on the journey of your lifetime… we will shortly be arriving into the jewel of south London, East Croydon… make sure you take care of your luggage, it is East Croydon after all…”