Hi Everybody.
Rich, the signals that the PFX refers to are known as " feather indicators". Which I have used in my North Devon branch lines route.
I could not find any on the CMP for Trainz, but a company known as railwaves has produced them as payware. They do need a bit of patience to get working but are very accurate in indicating up to six offsets from the track the player or A1 train is on once you get the hang of placing and linking them.
@ Bill, Railwaves is still there but there's been nothing new for Trainz in ages.
@ tension69 - if you search the DLS under the username bloodnok, you will find so many signals your head will spin. There are also a set of feathers that Bill refers to along with theatre indicators.