Approach Restricting

[NW Mailing List]

The Diverging Approach Diverging has been used at Ashby on the Valley 
line, since the track upgrade. As a northbound train can take the siding 
at Ashby and then cross back over to the main at Success. Southbound I 
think it is also used for a train leaving the siding that is headed 
down  the valley at Riverton (not B-Line) as that is a diverging move at 
Riverton now, I do not recall hearing a train call it southbound yet, 
but I just plan may be drawing a blank. I DO know that it is used 
northbound though.

Nathan

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

On 8/6/2013 21:54, NW Mailing List wrote:

> Well, this has been a most interesting conversation!  I've enjoyed the

> discussion.  Y'all have a good grasp of signals.

>

> As for Approach Restricting, the N&W did have that in one and only one

> set of rules (from the '60's I think) that I have seen, but I don't

> have a copy of them.  It was a right to left descending diagonal

> (approach) over a left to right descending diagonal.  They evidently

> didn't use it much.  I know of no signal that is set up to display

> that combination.  It is all in the signal logic and relay circuits.

>

> Just because a signal is rigged as a "full house", or able to display

> every aspect, doesn't mean that it actually does display them all.  A

> signal just before a switch that "could" show an Advance Approach

> doesn't necessarily need to.  In fact, in some cases it shouldn't.  It

> may have that lower aspect just so it can display a Diverging

> Approach, or Diverging Approach Diverging (the lower arm flashing).

>

> The only signal I had on my territory that could give Diverging

> Approach Diverging was at VN near Salem where the N&W eastbounds would

> cross over to the VGN.  The reason they got that aspect was because

> they were diverging at VN, but then would be diverging again at the

> next signal beyond it at Salem Connection.  It is an extraordinary set

> of circumstances that requires that aspect, so there aren't that many.

>   I remember we had a few on the Pokey like that, one at Sycamore cut

> westbound comes to mind.  We retired that signal in the spring of '08.

>   It's new colorlight replacement can show that also.

>

> Y'all keep talkin!!  You're figuring it out!

>

> Ben Blevins

> Signal Maintainer and Lead Signalman

>

> On 8/6/13, NW Mailing List <nw-mailing-list at nwhs.org> wrote:

>> Earlier, rules regarding signal indications related the speed in the name,

>> at least in that "diverging" was earlier termed "medium."

>>

>> I'm not aware of where "Approach Restricting" would have been used on the

>> former N&W, but I recall seeing "Approach" displayed in advance of a

>> "Restricting" indication just as in advance of a "Stop and Proceed."

>>

>> The one "Diverging Aproach Diverging" I've seen was Roanoke EB at 2nd Ave

>> where the signal and crossover spacing gets tight.

>>

>> Grant Carpenter

>>

>>> Date: Tue, 06 Aug 2013 10:24:01 -0400

>>> Subject: Re: Approach Restricting, was: "Pole and Paddle" semaphores

>>>

>>> On 8/6/2013 8:53 AM, NW Mailing List wrote:

>>>> I would speculate that N&W and Southern differed in similar ways, to

>>>> some degree. Southern seems to have had no problem with an approach

>>>> restricting signal, assuming that the train crews would understand the

>>>> potential and act accordingly.  Basically, if somebody hit that

>>>> caboose just beyond the signal, then they weren't running restricted

>>>> speed in the first place.  It sounds like the N&W assumed the crews

>>>> would (or at least might) be speeding and not complying with the

>>>> signal, so to prevent the resulting accident they eliminated the

>>>> potential by eliminating the signal.  Or maybe I'm just reading way

>>>> too much into the whole thing.

>>> The whole idea of an "Approach Restricting" signal seems redundant to

>>> me. If you came up on an approach signal, then you should be prepared to

>>> stop at the next signal, which would mean you should be at or below

>>> restricted speed when you came in sight of the next signal (depend on

>>> sight distance). If that signal is "Restricting", then pass it according

>>> to the rules.

>>> I don't know of any "A/R" signals on any line out of Roanoke.

>>> There is also a signal in the rule book that I have never seen. That is

>>> the "Diverging Approach Diverging" aspect, where the bottom lights are

>>> flashing. I hear they are out there somewhere, but, I've never seen one.

>>>

>>> Jimmy Lisle

>>> sci

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