AC Track, Polar Line ?

[NW Mailing List]

I know this will be a going-out-on-the-limb question for this group, but I'll ask it anyway and might get lucky. 

When the N&W installed AC Track Circuits, did they use DC Polar Line for the control circuits? If so, what type relays did they use as Line Relays? What type relays did they use for Track Relays -- Model 15's, SLV's, TV-30's ? 

If we could find the issue of Railway Signal Engineer covering N&W's installation of AC Track Circuits, it would no doubt contain the answers to all these questions. It would also tell us where the N&W built its own power generating facilities, and where it bought commercial AC. 

-- abram burnett 
the needle-in-a-haystack guy 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://six.pairlist.net/pipermail/nw-mailing-list/attachments/20130909/663ba06a/attachment.htm>