Ferntree Gully to Belgrave is worked under CTC rules controlled from
Upper Ferntree Gully. A Large panel is situated in the Station building
and was the first? of the CTC panels. (incidently, FTG is the only place
where I've seen 1 lever (switch) used to control 4 signals and 1 set of
Points)
Heidelberg to Rosanna is loosly classified as Station Limits. It has a
very loose version of Lever Locking and Track Control as the entire
interlocking is controlled from the Frame at Heidelberg.
Westgarth to Clifton Hill was LLTC and I belive this comes under ATC
(automatic & Track control) now that Metrol has control.
Lever Locking and Track Control is perfectly exhibited on the Up Line
from Camberwell to Riversdale for the Shuttle Trains.
-- Thanks Tony G.