"Tim Roll-Pickering" wrote:
elyob wrote:

Wouldn't it be easy enough to let the gates know which train has
come
in and then check the validity? i.e. if it's a fast from Surbiton,
no
way could a Vauxhall be valid.

Too many trains come in at once and also, IIRC, passengers are able to
move
between platforms behind barriers so there's no way one can fairly
assume
what stations a passenger could and couldn't have used.

Indeed-and at Victoria this is an essential part of the pedestrian flow
(i.e. a trainful of experienced commuters arriving on plat 3 will know
to spread out and use all 3 barrier lines, thus dispersing incoming
passengers much more quickly than if they were limited to the centre
gateline).

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Current nearest station: City Thameslink