signaling (was signal brackets)

[NW Mailing List]

Mike,
With regard to your first question, I think previously in the list it was
mentioned that NS Had changed it to proceed at restricted speed so you
didn't have to restart your train, but that this practice had resulted in
several incidents in which engineers proceeded into the block at a speed
above that at which he was able to stop short of any train or other
obstruction.  At least after a complete stop, you couldn't be going very
fast for a little while.
If one bulb was out, you still had the color of the remaining lamp to show
the aspect, and besides, what color lens would you have put over that
center bulb?
Jim C.


On Fri, Mar 29, 2024 at 1:54 PM 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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