In message , at 10:02:16 on Tue, 21 Jun
2016, tim... remarked:

10 people per minute.

Not a huge number, is it?

I know that they arrive at the station (and the airport) in waves, but
ISTM that wave will flatten itself out due to the normal differences
that people have in walking time (with their luggage) from the platform
to the start of the walkway.

It's far too small a number to justify a project as ambitious as you
suggest.
--
Roland Perry