signaling (was signal brackets)

[NW Mailing List]

Stop and Proceed to differentiate it from Stop and Stay. Stop and Stay was an absolute signal found at interlocking and control points and for entry into single track in non-CTC territory. Stop and Proceed was a permissive signal and in general was found on intermediate signals.

The center lights provided no additional information since they were always on. Whether the aspect was horizontal,  vertical, or 45 degrees (either way), the center light was on. The only place they were useful after conversion to color position was on the bottom head where red horizontal over a single center red was Stop and Stay while red horizontal with a number plate was Stop and Proceed.

-- 
Larry Stone
lstone19 at stonejongleux.com





> On Mar 29, 2024, at 6:17 AM, NW Mailing List <nw-mailing-list at nwhs.org> wrote:
> 
> Thank you Jim.
> A couple questions from even this "Intro to Signals 050" class
> 
> Why STOP AND PROCEED and not simply STOP?
> Is this because the train has authority and/or there is no oncoming train in front of it?
> 
> Why were the center lights removed from the earlier position lights? Simply cost savings? It seems like a 3rd light is one extra protection if one of the others burn out. For that matter (extremely sorry for the tangent), is there some electrical indication that a signal light is burned out that is displayed in an operations office, or was it simply reported by crews?
> 
> Mike Rector
> 
> On Fri, Mar 29, 2024 at 7:48 AM NW Mailing List <nw-mailing-list at nwhs.org> wrote:
> Mike, et al.,
> Thanks for your attachments.  Several years back, I went through a series of posts to try to explain to myself and others how N&W signaling was done.  I will try to present some of that information again and if you will ask specific questions, I will provide the best answers I can and hopefully others will join in the conversations.
> First you have the block occupancy signals also called intermediate I believer because they are intermediate to control points.
> These signals have a single arem and can display only three aspects:
> 
> CLEAR: both the block you are entering and the subsequent block are unoccupied.
> Indication: Proceed at prescribed speed
> 
> APPROACH:  the block you are entering is unoccupied, but the subsequent block is occupied
> Indication:  Proceed at no greater than medium speed, preparing to stop at next signal
> 
> STOP AND PROCEED:  the block you are entering is occupied.
> Indication:  Bring your train to a complete stop and then proceed at no greater than restricting speed being prepared to stop short of any other train or obstruction.
> 
> I think these are the easiest to understand and I have included some photos of this type of signal.
> Let me know  your questions/comments etc.
> Jim Cochran
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