In article ,
Recliner wrote:
Of course, the system can be smart enough not to charge if someone does
touch in at a Heathrow station and touches out again a few minutes later at
a different, or even the same, Heathrow station.

The tube does that now, but I agree that gating the HeX and Connect will make life
for casual users far more exciting.

Do many people use the train just to get between terminals, as opposed
to continuing on or changing to another train? I'd think that most
people changing terminals would use the airside buses.