In message , Walter Briscoe
writes

That diagram is very helpful. Reference to a map suggests the route
would have been zapped by Westway construction.

The entire line was south of Westway. Had it survived, it would have
crossed what was then the short motorway from Westway to the Shepherd's
roundabout, but the road could easily have been built beneath the line
had it still been in use. Of course, it wasn't and so the embankment
down to the West London line was simply removed.

I can't imagine the route can ever have been very busy.

Trains were every 20 minutes each way (weekdays only) in 1929, with
additional services when there was an exhibition at Olympia. The service
was Edgware Road - Kensington Olympia (then called Kensington, Addison
Road).
--
Paul Terry