Position Light signalling

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Some two masted signals  supported on a single Y shaped post I though 
indicated where a single road split  into two routes, but on further study these 
are positioned where no such split  occurs. I also thought that signals were 
sighted to the right (Engineer's side)  but again not always does this hold 
true, although those on cantilevered  brackets seem to help in this way. 
Can anyone point me in the right  direction on these matters?
Rule 337 from N&W Rules & Regulation  effective 11/18/1951 - "Signals are 
located over or at  the
right of the track they govern, unless  otherwise provided." The "Y" shaped 
post supporting  the
two signal masts was identified as a bracket. As a  rule, on the Shenandoah 
and parts of the Radford
Division, the mast governing main track movement was  taller than the mast 
governing movement from
the leaving end of the siding.  Where there are  bracket signals governing 
movement in either direction
on two main tracks, the brackets are of  equal height  . Where two main 
tracks converge into one,  the
bracket signal would be at the leaving end of the two  main tracks, not at 
the entering end.
 
    I also see  that the heads themselves usually only have lights for a 
limited number of  indications to suit each individual case, the remainder of 
the positions having  blanking plates.
 
Until about 1960, most aspects were  displayed by three amber (yellow ? 
whatever!) lights in  various
positions (vertical, horizontal, or diagonal) on each signal target (a.k.a. 
head). As  color position
lights came into play, there was no need for the  center light because 
CPL's required but two lights
per head to conform to the signal aspect.  The  center hole was then 
plugged with a plate.
                                                                            
         Harry Bundy
 


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