Re: [CBQ] Question on Rule 501I - Permissive Signal

["Winton" <runextra@gmail.com>]

I am not familiar with exactly how the CB&Q interlocking or CTC signals 
electrically worked... but I suspect the lunar 'call on' Permissive light might 
have been automatic. That is if the dispatcher or tower operator pushed a 
button/pulled a lever/flipped a switch to Clear the signal for movement through 
the interlocking but the field circuits could not cause the main target signal 
to show Clear or Approach due to something in the block ahead, then the main 
signal head would stay red and the lunar would light instead.

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