Behold the educated words of S.Byers in uk.local.london:

When the new HEX Connect service starts the local service from
Paddington to Hayes will have to terminate at Hayes at the rarely used
bay platform 5.

However next year when the Connect service goes from Paddington to
Hayes to Heathrow it will have to stop at platform 1 – the platform on
the fast down line.

Otherwise it will have to use the down local platform 3 – but then it
will have to cross both fast lines to get onto the Heathrow branch.

The sad thing is, that's one of the more interesting items posted to
uk.local.london since midnight last...
--
Al

If a hungry man has water / and a thirsty man has bread / be not dismayed /
that when they trade / both come out ahead