In message , Olof Lagerkvist
writes

There is a similar strange Central Line connection on the other side of
London around White City where the overground Central Line tracks do
not end and disappear into a tunnel, but instead look like connected to
the West London Line. I wonder if such a connection ever existed around
there.

There was indeed once a connection from the Central line to the West
London line - it passed from the loop through the extensive sidings of
the West London Line just north of Uxbridge Road and was used for
primarily for moving coal wagons to the Central London Railway's power
station at Shepherds Bush, but it could also be used for occasional
stock movements on and off the Central Line.
--
Paul Terry