On Tue, 12 Feb 2008 20:55:03 GMT, wrote:

I can't remember what kind is at Gunnersbury etc, but on the Bakerloo
shared sections, I think the markers are NR style.

For both the Underground and Overground, right?

The Overground has "3 car stop" and "6 car stop" signs (or "S car
stop" at some stations instead), though 6 car trains never run (and it
may not even be possible). I don't think there are any stopping marks
for the Underground.