dwarf CPL minutia

Fri Apr 19 14:28:49 EDT 2024

Jimmy,
Sorry for wrong second picture.  Correct attached.
Jim C.

On Fri, Apr 19, 2024 at 9:36 AM NW Mailing List <nw-mailing-list at nwhs.org>
wrote:

> 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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>
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