CV signals

NW Mailing List nw-mailing-list at
Fri Jul 25 18:43:44 EDT 2014

Yes, the attached photo appears to be the westward signal on the west 
end of Boody Yard. The dummy mast indicates an unsignaled track (CRR 
interchange) between the signal and the nearest signaled track (siding). 
In addition to the usual aspects, both signals can display Advance 
Approach due to a short block beyond the next signal.

Without Advance Approach here, when the next signal displays Approach, a 
train passing it into the short block beyond cannot stop short of the 
following Stop signal. The Advance Approach here gives adequate notice 
to prepare to stop two blocks ahead. A photo of this signal looking east 
is on p.289, /N&W's Clinch Valley Line/ (Wolfe, Wilson & Mandelkern, 
available from the Commissary).

The block beyond this signal is also a short block, so the (preceding) 
westward signal at the east end of Boody Yard could also display Advance 
Approach when this signal displays Approach.

Grant Carpenter
On 7/19/2014 11:37 AM, NW Mailing List wrote:
> Carl:  I assume you are not a regular subscriber/reader of the mailing 
> list as we had a very useful discussion about the use of signals and 
> the significant variations in a long series of emails last summer, 
> fall and winter.  IF you can go back and read those emails 
> again..................... via  a search.
> As to aspects and rules you can use a railroad rule book which has all 
> of the aspects in it- and note that the rules and aspects change over 
> time, so get the rule book covering your desired time period.  We sell 
> a version of signal aspects and rules in our Commissary.
> The most important fact of the signal discussion to my mind is that 
> the signals are not anything like simple automotive traffic signals in 
> application- stop, go, caution.  Railroad signals are intended to 
> provide sufficient train spacing for safe braking as well as some 
> direction information and/or  safe speed information to the train crew 
> (depending on what version of rules are being used). The railroad 
> signals apply to a specific  section of railroad and how the railroad 
> intends to operate upon it.  Thus, taking example signals from the 
> real world/prototype and applying it to a/your model railroad will not 
> quite work as one should design the signal system and aspects to fit 
> to the way the modeler intends to run his model railroad.  Also, 
> railroads make numerous variations to their 'standard' way of doing 
> things as dictated by the expense of altering signals, line side 
> services (wiring, pole line, relays and such) and install signal 
> systems that meet their immediate needs while maybe not necessarily 
> meeting the universal agreement as to proper signaling.  They get the 
> job done as long as the crew is qualified for that district and 
> understands what to do and what the particular aspect means- that's 
> why they get qualified!  Qualification is important in territories 
> where existing signal systems from predecessor railroads may be in use 
> and the crew needs to understand, say ex-NKP, ex-PRR and old N&W 
> signals in the same district.
> I'll let other reply to you question about the Tacoma signals.
> Gary Rolih
> Cincinnati


RE: Signals for dummies
NW Mailing List <nw-mailing-list at>
7/15/2014 1:55 PM

"'NW Mailing List'" <nw-mailing-list at>

Thanks Russ,

Tough choice deciding whether to answer what I asked vs what I meant. 
Sorry.  The signal I attached is not the one from Tacoma as you pointed 
out -- my mistake.  That one is actually from Boody (I think).  The 
signals at the Tacoma siding are as you said missing the lower 
diagonal.  One thing I find curious it that if I found the right ones 
this time, they are high/low at one end, but both the same height at the 
other end.

So the location of the Orange loader is called Spring.  I thought it was 
still Tacoma.  Thanks for that tidbit as well.

Carl Woods

Richmond, VA
> *From:*NW-Mailing-List [mailto:nw-mailing-list-bounces at] *On 
> Behalf Of *NW Mailing List
> *Sent:* Monday, July 14, 2014 11:12 AM
> *To:* 'NW Mailing List'
> *Subject:* Signals for dummies
> A signal like the one in the attached photo is/was positioned at the 
> end of the siding at Tacoma, VA (visible as you are leaving the siding 
> and going back onto the single track main).  I'm interested in 
> understanding how it would be used and what the signal at that 
> location coming from the other direction would look like and how it is 
> used.
> I'd also be interested in any documentation explaining (again for 
> dummies) the various aspects and the rules associated with them.
> Carl Woods
> Richmond, VA

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