dwarf CPL minutia

[NW Mailing List]

Jim,
     Both of your photos are of the same signal box. I really don't 
understand what in the world you are trying to get at. Are you wanting a 
signal box that can display both "Restricting" and "Slow Approach"? If 
that is the case look at this from the '67 rule book.

Jimmy Lisle


On 4/19/2024 7:31 AM, NW Mailing List 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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