Ø It is combined with L.S.S. and its Normal aspect is Danger.
Ø ‘P’ marker shall not
be provided.
Ø As long as line
clear is not obtained through the Block Instrument, it works as L.S.S.
Ø After L.C. is
obtained through the Block Instrument, it works as Distant Signal for a GSS or FSS also.
Ø It shall not be
taken ‘OFF’ until Line clear has been obtained from the block station in
advance.
