[CBQ] Question on Rule 501I - Permissive Signal

["Tom Mack via Groups.Io" <thommack=yahoo.com@groups.io>]

Hopefully a ex-CB&Q employee can help me with this one. Rule 501I (501"eye") was a permissive signal - "Proceed at restricted speed through entire block". It was either a red signal with a milepost number plate or a red signal with a lunar. Here are my questions:

1. I found a photo of a single red searchlight with a lunar signal at Savanna at the single track MILW diamonds on the Q just south of the double-track MILW diamonds. This MILW track was a MILW branchline that went south, and was probably not all that busy. If I am reading Rule 501I correctly, the lunar was used so that the signal could be set to Permissive for this diamond if the dispatcher decided to do so by lighting the lunar. Otherwise, if the dispatcher left the lunar off (unlit), the signal became a 501J Stop - "Stop before any part of train or engine passes the signal". Is this correct that a lunar would cause the signal to become either 501I or 501J depending on the dispatcher lighting the lunar? (A signal with a permanent milepost number plate would always be 501I.)

     1a. BTW, in the BN Signal Aspects and Indications dated July 1, 1974 it appears 501I became 501J - Stop and Proceed.

2. Since the Q did not have a "Stop and Proceed", did a train have to stop first at a Rule 501I signal before proceeding at Restricted Speed, or did it just roll through the red signal at Restricted Speed?

3. Assuming number 2 above is that the train did not have to stop, in actual practice, how did Restricted Speed differ from the speed through a Rule 501E "Approach" (yellow) signal?

Thanks!

-- 
Tom Mack
Cincinnati, OH

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