dwarf CPL minutia

[NW Mailing List]

You make a good point. Colored, it’s more complicated. With all white and the curve on the right, restricting is simply light the top and bottom right. But on a colored dwarf, that would be green on top and red on the bottom right, not a defined signal.

The attached is from the 3/1/1981 rule book. What’s interesting is that Slow Clear and Slow Approach are both depicted using a curve on the left dwarf but the first with a green on top and the second with a yellow on top meaning the same signal could not display both. And Restricting uses the curve on the right with a yellow on top. None of the depicted signals use the 45 light. I’m not convinced which side the housing curve was on was relevant and what’s in the rule book may have just used what art was available. 

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-- 
Larry Stone
lstone19 at stonejongleux.com





> On Apr 19, 2024, at 4:31 AM, NW Mailing List <nw-mailing-list at nwhs.org> wrote:
> 
> Thanks for the reply, Larry.
> Let me see if I can make my question a little clearer with the help of pictures.  In the first attachment (late era, or curve to the left), it can readily be seen that slow clear, restricting and stop can be displayed with indications quite analogous to their taller brothers.  What isn't clear is how to display slow approach, unless you light amber/yellow and lower left red, which gives you a funky backslash angle close to vertical.
> Similarly with picture 2 ( early era, or curve to the right), it can readily be seen that slow clear, slow approach and stop are covered, but restricting would require another bastardization with yellow and lower right red which again would have been at nearly vertical.  Other displays would have been possible that had no correlation to semaphore arm positions, and I think I have seen one instance where a amber/yellow bulb with used in the top position to yield a better restricting display when combined with  the lower right red, but at the sacrifice of being able to display slow clear.
> Thanks for the input.
> Jim Cochran
> 
> On Fri, Apr 19, 2024 at 6:53 AM NW Mailing List <nw-mailing-list at nwhs.org> wrote:
> I have never been aware of any rule book that dealt with dwarf PL signal (colored or all-white) where the housing design made a difference. At night, it would be difficult to see the housing. It’s all about the lights and whatever needs to be lit can be taken care of in the wiring so both the top and bottom on the curved side can be lit to display the reverse of the housing’s natural diagonal aspect.
> 
> At the Illinois Railway Museum, we use dwarf PL signals as routing (switch position) indicators. One of them is at a three-way split and we use one diagonal for routed to the left track and the other diagonal for the right track (and vertical for the middle track; horizontal indicates the switch is not properly lined for any movement and as you might expect with a horizontal signal, means stop). So we use all four aspects it can display.
> 
> -- 
> Larry Stone
> lstone19 at stonejongleux.com
> 
> 
> 
> 
> 
> > On Apr 18, 2024, at 12:56 PM, NW Mailing List <nw-mailing-list at nwhs.org> wrote:
> > 
> > Jim,
> >     Ok, moving ahead to the March 1, 1981 rule book, the dwarf signals could display: Slow Clear, Slow Approach, Restricting, Stop and Stay (This name had simply changed to Stop in the December 15, 1999 rule book).
> > Now to your question. The picture of the dwarf signal in the '67 rule book has the top of the signal box curved on both sides at the top. It really makes no difference what shape the box is in as it is all about the aspect. The dwarf signal "Restricting" aspect is yellow on the top left with red on the lower right. 
> > Jimmy Lisle
> > On 4/18/2024 12:02 PM, NW Mailing List wrote:
> >> Thanks for the reply, Jimmy.  The attachments from an NS 1992 timetable indicate that the  "curve on the left" style could show:  slow clear, slow approach and stop.  Does your '67 rule book show that this type could display restricting by lighting the amber/yellow and the lower right red positions? 
> >> Does anyone have pictures or pointers to pictures showing dwarf CPLs in use?
> >> Thanks again,
> >> Jim Cochran  
> >> 
> >> On Thu, Apr 18, 2024 at 9:54 AM NW Mailing List <nw-mailing-list at nwhs.org> wrote:
> >> Jim,
> >>      The old PL dwarf signals could display the following: Clear, 
> >> Restricting, Stop and Flag (Number Plate) [This was at restricted speed 
> >> protecting against trains approaching with the current of traffic.], 
> >> Stop and Stay.
> >> 
> >>      The CPL dwarf signals (Rule book effective January 1, 1967) could 
> >> display: Slow Clear, Slow Approach, Restricting, Stop and Proceed 
> >> (Number Plate), Stop and Stay.
> >> 
> >> Hope this helps.
> >> 
> >> Jimmy Lisle
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