[N&W] Signals

[nw-mailing-list at nwhs.org]

I have several questions about N&W signals and perhaps signals in general 
that I hope will stir some detailed answers/discussion.

1.  What was the manufacturer(s)/make(s)/model(s) for the semaphore signals 
that predated the position light signals on the N&W?

2.  What was the manufacturer(s)/make(s)/model(s) for the position light 
signals on the N&W?

3.  Can anyone point me to good references on placement of signals either 
in general or N&W specific?  The sort of thing I'm looking for is why the 
RR put signals where they did and what type of signal would be placed at 
what type of track configuration.

In trying to place signals on an N&W layout someday, it seems that to "get 
it right" you would either have to have photographs of the section you are 
modeling which show the track/signal arrangement (which would be difficult 
if not impossible in some cases), or else you'd need to know that if you 
put in, for example a crossover from one main to the other, you need X, Y, 
and Z, types of signals placed at positions A, B, and C.  These "rules for 
signal placement" are the types of information I'm looking for and 
hopefully it resides either in printed form or in the heads of some of our 
readers.
Adthanksvance,
Jim Cochran