"Richard J." wrote in message ...

However, with large numbers of foreign visitors likely to use Crossrail to
get to Heathrow, reliance on a PA announcement would not be sufficient to
dislodge everyone. They will need extra platform staff at Paddington IMO.

CCTV could play a useful role in checking the cars. It is likely that
cameras will be installed for security purposes, in any case, so it
may be possible to use them for this purpose also.