In message , at 13:13:46 on
Tue, 24 Apr 2012, Recliner remarked:
All the A stock trains were either 4 or 8-car (no 3-car units). I seem
to recall that the 4-car double-ended unit trains ran mainly at
weekends (in the 1970s, I lived in a flat that had a distant view of
the Met line).

I used A-stock to get to London and back (often outside normal commuting
hours) in the 90's, and don't recall ever seeing a short unit.
--
Roland Perry