What I meant to say was that the co-actor can be on the otherside of the track to the actual main signal. I can also be in advance of the main signal (in the direction of travel).
My understanding of the quoted standard is that it is both a) and b) need to be met.
In the 2009 question above they question states this:-
"Installation of new
My understanding of the quoted standard is that it is both a) and b) need to be met.
In the 2009 question above they question states this:-
"Installation of new