On 24 Feb, 13:12, wrote:
I haven't been there for several years, but as far as I remember the
station had seven platforms, two on the 'new' (d.c.) lines, two on the
slow, two on the fast and a bay which was disused years ago. The slow
line platforms normally have a few stopping trains, but additional
ones stop during engineering works which close the d.c. lines, and
when there are major events at the stadium. I don't think there are
any regular trains serving the fast line platforms, but they used to
be served by football trains; I don't know if they still are, or even
if 'football specials' still run.

Yup, the bay is the platform I'm referring to (though as I've only
ever seen it going past, I wasn't sure if there were in fact two bays,
as the end of the platform seemed to have two faces.)

As for your other comments, I seem to recall Virgin not wanting to
stop football trains as it would eat up paths. My random thoughts to a
solution to that would be to knock the bay through, and adjust the
track layout (shuffling the slow lines eastwards) to provide a loop
platform on the southbound fast line. Though, perhaps a better
alternative would be to have the loop platform on the slow lines, and
get football passengers to change at onto slow line services at
Watford which would run fast to Wembley (although these wouldn't be
too bad if the fast services simply skipped Watford on these occasions
and stopped at Wembley instead), though the loop could then be used in
peak hours to enable more services to serve Wembley.