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Bill:
In all of the signal research that I have done, all of the semaphores used by CB&Q in either manual block or automatic block territory were 60 degree, lower quadrant, two position signals. Because they were two position, each blade was capable of displaying
only two aspects, so if additional aspects were required, then more than one blade was used. In automatic block territory a distant signal was required.
The color of the blades is a little involved. In the first manual block territory between Hawthorne and Aurora, the upper or home blade was red with a square end and white stripe. Initially the blades were made of wood, but when the Q converted to steel blades,
the spec casting to which the blade was attached had three discs even though the blade had only two positions. Since the initial color for safety was White (Yellow color was not considered successful enough to use until about 1915 or so), the home signal
was equipped with one white disc and two red discs. The lower or cautionary blade was green with a fish-tailed end and white stripe, and one white and two green discs.
Although the first automatic block signals on CB&Q was in 1890, the Q began installing ABS in earnest in 1910-11. The signal design for single track was consistently 'home' and 'distant' signals with APB circuitry. Virtually all of the signals consisted of
one blade, with the major exception being the signal at the entering end of a siding, which was equipped with both 'home' and 'distant' blades. The 'home' blades at each end of the siding were red with square end and white stripe. Because the circuitry was
APB, the leaving (or starting) signal was absolute. All other 'home' signals were (at that time) stop and proceed (observing the rules). Most territory included intermediate 'home' signals, and these were YELLOW with square end and white stripe. All of
the 'distant' signals were green with forked end and stripe.
At some point, all of the yellow blades on intermediate home signals were changed to red. This was prior to rules of 1916. Prior to the rules of 1929, green blades on distant signals were replaced with yellow blades. Also, additional blades were added for
route indications at some locations, particularly the early CTC installations still using semaphores.
Glen Haug
From: CBQ@groups.io <CBQ@groups.io> on behalf of cbq_bill <cbq_bill@sbcglobal.net>
Sent: Saturday, August 22, 2020 2:49 PM
To: CBQ@groups.io <CBQ@groups.io>
Subject: [CBQ] CB&Q Semaphores
Did the Q use upper quadrant or lower quadrant semaphores ?
Were there additional styles of semaphores on the Q ?
What colors were the semaphores' blades ?
Thanks in advance !!!
Bill H
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