N&W Dwarf Signal

[NW Mailing List]

Can anyone tell me a few things about this type signal?  
   
  First of all, it is an N&W dwarf type signal used to indicate if a switch is lined normal or reverse, built out of old US&S PL2 light boxes on a home made stand, and it is obviously a home brewed signal out of the N&W signal shop.  
   
  What I want to know is, what exactly is the name the N&W used for them, and where all can they be found.  This one is at Rawl, WV, and it is still in working order.
   
  Ben Blevins
   

       
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