Originally Posted by
DaveReidUK
From the rail timetable, I would suggest. That's how the French are doing it.
But that is not logical. It assumes that the stations are the origin and destination, whereas the real majority origin and destination could be elsewhere, especially where the linked airports are not close to city centres.
As with so many "environmental" proposals, this is a political grand gesture rather than a reasoned assessment of where journeys begin and end (and the consequential environmental impacts.
In the UK, there is a very large concentration of euro/multinational businesses HQ's along the Thames valley west of LHR, for which services ex LHR are the logical mode for travel to/from the UK regions. Traipsing from home to Reading Central to King's Cross for a train to Newcastle is not time effective, and may be of limited if any environmental benefit.