Wig Wag Crossing Signals

[nw-modeling-list at nwhs.org]

I do not know a thing about the N&W Wig Wag Crossing Signals.   Would someone 
be so kind as to give a little history as to when and where they  were used.
 
I am in the early phase of building a small layout loosely based on the  
Durham District's Durham Beltline, 1915-1925.  Would this signal be  appropriate 
for that country side - town limit area that existed where  the Belt Line lay 
at that time?
 
Chuck Stewart
Bahama, NC
mp L103, Durham District
(Northern Durham County, just south of Rougemont and north of  Willardsville)
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