Model Board Symbology Questions

[NW Mailing List]

Hello Mystery Person (no signature on the email):

See below for some of the answers you seek.

On Sun, Dec 29, 2019 at 11:10 AM NW Mailing List via NW-Mailing-List <
nw-mailing-list at nwhs.org> wrote:

> Hi All.
>
> I have a photo of Circleville Tower’s model board and have some questions
> about the symbology/nomenclature used. See the attached photo for references
>


> Signal 6794 - The symbol for this signal has what appears to be a lower
> arm. Signal 6778 does not have this. What is it?
>
> It is a lower arm, so it could show an advanced signal to 6778, I grew up
along this line, and eventually the signal  679.4 could show advanced
approach, followed by an approach at 6778 for an all stop at 6R (which was
Stop and Stay and controlled by Circleville tower).

Signal 6R is similar in appearance to 6778, except that 6R has a “hollow”
quadrant. What does this difference indicate? Is it a home signal compared
to an ABS signal perhaps (6R seems to be within the scope of the tower,
based on dad’s recollections).

6R is a home signal, absolute, stop and stay, controlled by Circleville.

Signal 6794/6778 are numbered based on milepost; what does 6R, 10L and
> similar mean? That they are within the interlocking plant?
>
>

> Yes, within the interlocking and controlled by a lever machine, the number
> indicated which lever and R or L indicated the direction. In this case,
> "6R" would be line for an eastbound and where as "6L" would be for a
> westbound. One easy way to remember is that "R" stood for River (or
> eastbound) and "L" stood for Lake (westbound)
>


> What do Triangles 9 and 17 on the Old Main indicate (for reference, the
> old SV main was used to switch local industries, and is still in place
> today)
>
 They indicated a derail.

Similarly, does the R / L simply indicate which side of the track the
signal is on? If so, why is this needed vs. just having unique numbers?
See above...

Is there any significance to the red/yellow alternating block colors beyond
making it easier to see where each starts and stops?
They indicate where the track circuits begin and end.



>
>
>
> Hope this helps...
>

Eric, formerly of Ashville on the Columbus District.


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