On May 15, 12:00 pm, asdf wrote:
Unless I've misunderstood something, according to a recent post
) and thread, there is a connection
from the fast lines to Watford, and it's currently being moved further
south.

All trains to Watford need to use the slow lines north of Harrow. The
connection you're thinking of allows trains from the slow lines to get
to Rickmansworth, not the other way round.

U