Control points, controlled signals and intermediate signals

[NW Mailing List]

Home signal is typically at a Control Point BUT not always. Some are 
automatic signals. A Home signal displaying Red can not be passed 
without permission by the dispatcher (talked by). A non-home signal 
displaying red is a 'Stop and Proceed" or 'Restricting" it depends on 
the era. Stop and Proceed, the train must stop and then may proceed at 
restricted speed. With a Restricting signal the train may pass it with 
out stopping but at restricted speed. Examples of Intermediate Home 
signals are the signals on either side of Elkhorn tunnel.

All Interlockinga are Control Points but not all Control Points are 
Interlockings. A Control Point is a Dispatcher controlled signal, an 
interlocking is a control point which has more then one route available 
(end of Siding, Crossover, etc), a non-interlocking Control Point is a 
Hold out. An example of a line with such is the old Punkin Vine, an 
example of a Hold Out Control Point would be Rockey Mount. Where there 
is no siding or alternate route, but there is a Control Point. I believe 
the Control Point term has come into use thanks to the old Conrail 
territory where Controlled Signals were called CP-5 (Control Point at 
MP5) CP-10 (MP10) etc.

Intermediate Signals are signals between Distant signals. A distant 
signal is the 'approach' signal to a control point. Example. At Sampson, 
if you are coming south and are to take the Siding you would get an 
Approach Diverging at 132.1 (I think that's right) 132.1 is the Distant 
signal to Sampson. then at 128.? you have the Distant signal to Lynnwood.

Jimmy, Ben, Y'all chime in here. I know I got something wrong.

Nathan

Nathan Simmons
trainman51 at gmail.com
http://www.t-51.org
KI4MSK

On 8/19/2013 17:19, NW Mailing List wrote:

> Jimmy,

> Good information, but I still don't see definitions for some of the 

> terms that are being kicked around in these discussions.  For example: 

>  control point, controlled signal and  intermediate signal don't seem 

> to be mentioned.  Home signal is defined as "A fixed signal at the 

> entrance of a route or block to govern trains or engines entering and 

> using that route or block".  This implies to me that a home signal 

> could be an automatic block signal as well as an interlocking signal. 

>  Previously, I had associated the term home signal only with 

> interlockings.  Also, there seems to be no definition for distant 

> signal.  Would a distant signal be any signal that gives a "preview" 

> of the aspect of a corresponding/subsequent home signal?

> Jim Cochran

>

>

> On Mon, Aug 19, 2013 at 3:07 PM, NW Mailing List 

> <nw-mailing-list at nwhs.org <mailto:nw-mailing-list at nwhs.org>> wrote:

>

>     Jim,

>         Maybe this will help.

>

>     Jimmy Lisle

>

>     Moderator:

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>     http://nwhs.org/wiki/tiki-browse_image.php?imageId=546

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