Riversdale "B" signalbox has a control lever No 18 for accepting down
moves on the Up line from Camberwell. No matter how butchered the LLTC
system became in its transition to ATC, this is a perfect example. I
don't believe the principle of LLTC changed at all, just its definition
under the new and very sparce rule book.
-- 
                    
Thanks 
Tony G.