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Tom:
I did not see the signal diagram that was posted. The signals that you
indicated have three heads are actually 3 color light signals at intermediate signal locations. I believe all of the intermediate signals on the single track portions of the Aurora to Savanna line were 3 color light. The intermediate signals on bridges between
Steward Jct. and Flag Center were searchlights.
The small single (purple) light attached below the main signal head indicates
that the signal is a grade signal. Practically speaking, trains were not required to stop at grade signals. On the Aurora to Savanna line, intermediates were equipped with grade lights if located on ascending grades of 0.7% or more. I glanced at the Consolidated
Code of 1967, and could not find any information on grade signals, or aspects for same. They are discussed in the 1951 Rules of the Operating Department, under signal rule 501-H, and could be passed at 15 mph if displaying RED (normally Stop and Proceed).
By 1967, intermediate signals (with a number plate) on CB&Q displaying RED were no longer Stop and Proceed, but instead were Permissive, meaning they could always be passed at Restricted Speed. This change in the rule effectively made grade signals obsolete,
and may have been the reason for the absence of the rule in the 1967 Code.
Glen Haug
From: CBQ@groups.io <CBQ@groups.io> on behalf of Tom Mack via groups.io <thommack=yahoo.com@groups.io>
Sent: Saturday, December 24, 2022 9:25 AM
To: CBQ@groups.io <CBQ@groups.io>
Subject: Re: [CBQ] C & I Diagram
On Tue, Dec 13, 2022 at 10:09 AM, Richard Gortowski wrote:
We're looking at putting in signals for the Steward to Oregon layout (in 1950) that I'm building.
Rich and Group,
Thanks for posting the C&I Signal Diagram. One thing I found very interesting and wonder if it changed by the 60's. The diagram shows most of the signals on the single track portions as having three signal heads. I can't recall seeing photos of any three signal
head signals along the C&I. I went to the CB&Q signal diagrams document I have, as well as the 1967 Consolidated Rules book, and it appears that the bottom (third) signal would give indication for restricting while the second down (center signal in a three
signal setup) would define the diverging route aspect. Since there was only one signal between each of the signal controlled sidings did the Q use a three searchlight signal to add restricting or what is the diagram wrong in showing three light signals?
Second, it appears that a number of southbound signals show a small offset lunar(?) to the bottom right. The Consolidated Code book of 1967 doesn't show any signals with a lunar at the bottom right. What is this for? (An example of one of these southbound signals
is shown below signal N110.7 just north of Stratford.)
--
Tom Mack
Cincinnati, OH
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