On Sun, 4 Oct 2009 08:53:17 -0700 (PDT), Andy wrote:

Supposedly there isn't capacity to do this, due to the large number of
'extra' trains now running on the slow lines, even at weekends. The
mainline platforms at Queen's Park are used by a couple of early
morning / late evening trains though (this isn't advertised in the
timetable due to possible engineering work, but the stops are shown on
the Live Departure Boards).

I'm not sure why they bother with these "secret" stops there, based on
my experience of taking a late-night train out of Euston. The train
was advertised even on the departure screens as first stop Wembley
Central. It did in fact stop at Queens Park, but unsurprisingly no-one
got on or off.