There were a couple of messages posted in July regarding photos in this new
book. While looking at my newly arrived copy, I noticed another photo taken at
Hinsdale, in the middle of page 173, that documents a little bit of signal
history.
This photo is taken looking east from the west end the new Highlands remote
control interlocking that was constructed (along with West Hinsdale) in 1954.
It is probably one of the earliest photos of the 4 track signal bridge at MP
16.69. It had been installed new at MP 11.60 east of Hollywood in 1913, and
was taken down in 1953 when signal respacing for cab signals was being
progressed, and re-used here for the new control point.
Notice the 3rd (bottom) target on the Main 1 Eastward signal. It does not
appear in later (i.e. 1960's) photos. But in 1954, Main 1 was still a Westward
Main between Congress Park and Highlands, and trains running against the
current ran under Manual Block System rules. A train running east on Main 1
from this location would get a Restricting signal aspect, which for this
location needed to be RED over RED over YELLOW, per Rule 501G, Fig 2. Thus the
requirement for the 3rd target. In early 1959, when CTC was extended to
include from Congress Park to West Hinsdale, Main 1 was made bi-directional
between these two points, and the 3rd target was removed.
A similar 3rd target was installed on the Main 3 Westward signal at MP 17.50 at
West Hinsdale, because Main 3 was an Eastward Main between West Hinsdale and
Eola, therefore requiring the same signal aspect for a westward move on Main 3.
When CTC was extended to Downers Grove in late 1959, this 3rd target was also
no longer required.
Glen Haug
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