The Jubilee line has been resignalled since then and, AIUI, Bakerloo Line trains would now require a possession (between at least Neasden and Baker Street, probably Wembley Park to Waterloo in practice) to get to and from Neasden depot.
But they still have a colour light?
No, there are no lineside signals on the Jubilee line.
The essential things in life are seen not with the eyes, but with the heart. --Antoine de St. Exupery